diff --git a/configure.ac b/configure.ac
index c7f1df31d6148b568c22e6ed5ebc33fc9ff73abf..50619f589b9377001538f3c62870c72249b3f102 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # Init the project.
-AC_INIT([SWIFT],[0.8.0],[https://gitlab.cosma.dur.ac.uk/swift/swiftsim])
+AC_INIT([SWIFT],[0.8.1],[https://gitlab.cosma.dur.ac.uk/swift/swiftsim])
 swift_config_flags="$*"
 
 #  We want to stop when given unrecognised options. No subdirs so this is safe.
@@ -60,6 +60,10 @@ if test "x$ax_enable_debug" != "xno"; then
    AC_DEFINE([SWIFT_DEVELOP_MODE],1,[Enable developer code options])
 fi
 
+# C++ in GCC 6 and above has an issue with undefined the min() and max()
+# macros. This hack works around that.
+AC_DEFINE([_GLIBCXX_INCLUDE_NEXT_C_HEADERS],1,[Hack for min() and max() using g++ 6+])
+
 # Enable POSIX and platform extension preprocessor macros.
 AC_USE_SYSTEM_EXTENSIONS
 
@@ -270,6 +274,18 @@ if test "$enable_debugging_checks" = "yes"; then
    AC_DEFINE([SWIFT_DEBUG_CHECKS],1,[Enable expensive debugging])
 fi
 
+# Check if cell graph is on.
+AC_ARG_ENABLE([cell-graph],
+   [AS_HELP_STRING([--enable-cell-graph],
+     [Activate the cell graph @<:@yes/no@:>@]
+   )],
+   [enable_cell_graph="$enableval"],
+   [enable_cell_graph="no"]
+)
+if test "$enable_cell_graph" = "yes"; then
+   AC_DEFINE([SWIFT_CELL_GRAPH],1,[Enable cell graph])
+fi
+
 # Check if using our custom icbrtf is enalbled.
 AC_ARG_ENABLE([custom-icbrtf],
    [AS_HELP_STRING([--enable-custom-icbrtf],
@@ -294,6 +310,18 @@ if test "$enable_naive_interactions" = "yes"; then
    AC_DEFINE([SWIFT_USE_NAIVE_INTERACTIONS],1,[Enable use of naive cell interaction functions])
 fi
 
+# Check whether we want to default to naive cell interactions (stars)
+AC_ARG_ENABLE([naive-interactions-stars],
+   [AS_HELP_STRING([--enable-naive-interactions-stars],
+     [Activate use of naive cell interaction functions for stars @<:@yes/no@:>@]
+   )],
+   [enable_naive_interactions_stars="$enableval"],
+   [enable_naive_interactions_stars="no"]
+)
+if test "$enable_naive_interactions_stars" = "yes"; then
+   AC_DEFINE([SWIFT_USE_NAIVE_INTERACTIONS_STARS],1,[Enable use of naive cell interaction functions for stars])
+fi
+
 # Check if gravity force checks are on for some particles.
 AC_ARG_ENABLE([gravity-force-checks],
    [AS_HELP_STRING([--enable-gravity-force-checks],
@@ -1185,6 +1213,16 @@ if test "$have_armv7apmccntr"x = "yes"x; then
 	AC_DEFINE(HAVE_ARMV7A_PMCCNTR,1,[Define if you have enabled the PMCCNTR cycle counter on ARMv7a])
 fi
 
+# Check if we have native exp10 and exp10f functions. If not failback to our
+# implementations. On Apple/CLANG we have __exp10, so also check for that
+# if the compiler is clang.
+AC_CHECK_LIB([m],[exp10], [AC_DEFINE([HAVE_EXP10],1,[The exp10 function is present.])])
+AC_CHECK_LIB([m],[exp10f], [AC_DEFINE([HAVE_EXP10F],1,[The exp10f function is present.])])
+if test "$ax_cv_c_compiler_vendor" = "clang"; then
+      AC_CHECK_LIB([m],[__exp10], [AC_DEFINE([HAVE___EXP10],1,[The __exp10 function is present.])])
+      AC_CHECK_LIB([m],[__exp10f], [AC_DEFINE([HAVE___EXP10F],1,[The __exp10f function is present.])])
+fi
+
 # Add warning flags by default, if these can be used. Option =error adds
 # -Werror to GCC, clang and Intel.  Note do this last as compiler tests may
 # become errors, if that's an issue don't use CFLAGS for these, use an AC_SUBST().
@@ -1933,6 +1971,7 @@ AC_MSG_RESULT([
    Interaction debugging       : $enable_debug_interactions
    Stars interaction debugging : $enable_debug_interactions_stars
    Naive interactions          : $enable_naive_interactions
+   Naive stars interactions    : $enable_naive_interactions_stars
    Gravity checks              : $gravity_force_checks
    Custom icbrtf               : $enable_custom_icbrtf
 
diff --git a/doc/RTD/source/AnalysisTools/index.rst b/doc/RTD/source/AnalysisTools/index.rst
new file mode 100644
index 0000000000000000000000000000000000000000..f68fa77536e77df48cd1acc44e98a3408e48b037
--- /dev/null
+++ b/doc/RTD/source/AnalysisTools/index.rst
@@ -0,0 +1,35 @@
+.. AnalysisTools
+   Loic Hausammann 20th March 2019
+
+.. _analysistools:
+
+Analysis Tools
+==============
+
+Task dependencies
+-----------------
+
+At the beginning of each simulation the file ``dependency_graph.csv`` is generated and can be transformed into a ``dot`` and a ``png`` file with the script ``tools/plot_task_dependencies.py``.
+It requires the ``dot`` package that is available in the library graphviz.
+This script has also the possibility to generate a list of function calls for each task with the option ``--with-calls`` (this list may be incomplete).
+You can convert the ``dot`` file into a ``png`` with the following command
+``dot -Tpng dependency_graph.dot -o dependency_graph.png`` or directly read it with the python module ``xdot`` with ``python -m xdot dependency_graph.dot``.
+
+
+Cell graph
+----------
+
+An interactive graph of the cells is available with the configuration option ``--enable-cell-graph``.
+During a run, SWIFT will generate a ``cell_hierarchy_*.csv`` file per MPI rank.
+The command ``tools/make_cell_hierarchy.sh cell_hierarchy_*.csv`` merges the files together and generates the file ``cell_hierarchy.html``
+that contains the graph and can be read with your favorite web browser.
+
+With chrome, you cannot access the files directly, you will need to either access them through an existing server (e.g. public http provided by your university)
+or install ``npm`` and then run the following commands
+
+.. code-block:: bash
+   
+   npm install http-server -g
+   http-server .
+
+Now you can open the web page ``http://localhost:8080/cell_hierarchy.html``.
diff --git a/doc/RTD/source/SubgridModels/EAGLE/EAGLE_SF_EOS.svg b/doc/RTD/source/SubgridModels/EAGLE/EAGLE_SF_EOS.svg
new file mode 100644
index 0000000000000000000000000000000000000000..398c2bd88331cff072cd82590d4691f0c48bc148
--- /dev/null
+++ b/doc/RTD/source/SubgridModels/EAGLE/EAGLE_SF_EOS.svg
@@ -0,0 +1,2353 @@
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diff --git a/doc/RTD/source/SubgridModels/EAGLE/index.rst b/doc/RTD/source/SubgridModels/EAGLE/index.rst
index 620572f962948308884414622ca2ae7d555d158f..b9942628563f5ccc56bd44ee90270dd65cff2e44 100644
--- a/doc/RTD/source/SubgridModels/EAGLE/index.rst
+++ b/doc/RTD/source/SubgridModels/EAGLE/index.rst
@@ -17,9 +17,10 @@ Entropy floors
 The gas particles in the EAGLE model are prevented from cooling below a
 certain temperature. The temperature limit depends on the density of the
 particles. Two floors are used in conjonction. Both are implemented as
-polytropic "equations of states" :math:`P = P_c
-\left(\rho/\rho_c\right)^\gamma`, with the constants derived from the user
-input given in terms of temperature and Hydrogen number density.
+polytropic "equations of states":math:`P = P_c
+\left(\rho/\rho_c\right)^\gamma` (all done in physical coordinates), with
+the constants derived from the user input given in terms of temperature and
+Hydrogen number density.
 
 The first limit, labelled as ``Cool``, is typically used to prevent
 low-density high-metallicity particles to cool below the warm phase because
@@ -27,12 +28,7 @@ of over-cooling induced by the absence of metal diffusion. This limit plays
 only a small role in practice. The second limit, labelled as ``Jeans``, is
 used to prevent the fragmentation of high-density gas into clumps that
 cannot be resolved by the coupled hydro+gravity solver. The two limits are
-sketched on the following figure. An additional over-density criterion is
-applied to prevent gas not collapsed into structures from being
-affected. This criterion demands that :math:`\rho > \Delta_{\rm floor}
-\Omega_b \rho_{\rm crit}`, with :math:`\Delta_{\rm floor}` specified by the
-user and :math:`\rho_{\rm crit}` the critical density at that redshift
-[#f1]_.
+sketched on the following figure.
 
 .. figure:: EAGLE_entropy_floor.svg
     :width: 400px
@@ -51,6 +47,15 @@ user and :math:`\rho_{\rm crit}` the critical density at that redshift
     the figure for clarity reasons, typical values for EAGLE runs place
     both anchors at the same temperature.
 
+An additional over-density criterion above the mean baryonic density is
+applied to prevent gas not collapsed into structures from being
+affected. To be precise, this criterion demands that the floor is applied
+only if :math:`\rho_{\rm com} > \Delta_{\rm floor}\bar{\rho_b} =
+\Delta_{\rm floor} \Omega_b \rho_{\rm crit,0}`, with :math:`\Delta_{\rm
+floor}` specified by the user, :math:`\rho_{\rm crit,0} = 3H_0/8\pi G` the
+critical density at redshift zero [#f1]_, and :math:`\rho_{\rm com}` the
+gas co-moving density. Typical values for :math:`\Delta_{\rm floor}` are of
+order 10.
 
 The model is governed by 4 parameters for each of the two
 limits. These are given in the ``EAGLEEntropyFloor`` section of the
@@ -280,7 +285,7 @@ these elements from the abundance of `Si`. More specifically, we assume that
 their abundance by mass relative to the table's solar abundance pattern is the
 same as the relative abundance of `Si` (i.e. :math:`[Ca/Si] = 0` and
 :math:`[S/Si] = 0`). Users can optionally modify the ratios used for `S` and
-`Ca`.
+`Ca`. Note that we use the *smoothed* abundances of elements for all calculations.
 
 Above the redshift of Hydrogen re-ionization we use the extra table containing
 net cooling rates for gas exposed to the CMB and a UV + X-ray background at
@@ -288,9 +293,13 @@ redshift nine truncated above 1 Rydberg. At the redshift or re-ionization, we
 additionally inject a fixed user-defined amount of energy per unit mass to all
 the gas particles.
 
-In addition to the tables we inject extra energy from Helium re-ionization using
-a Gaussian model with a user-defined redshift for the centre, width and total
-amount of energy injected per unit mass.
+In addition to the tables we inject extra energy from Helium II re-ionization
+using a Gaussian model with a user-defined redshift for the centre, width and
+total amount of energy injected per unit mass. Additional energy is also
+injected instantaneously for Hydrogen re-ionisation to all particles (active and
+inactive) to make sure the whole Universe reaches the expected temperature
+quickly (i.e not just via the interaction with the now much stronger UV
+background).
 
 For non-cosmological run, we use the :math:`z = 0` table and the interpolation
 along the redshift dimension then becomes a trivial operation.
@@ -326,7 +335,7 @@ they are listed for every gas particle:
 +---------------------+-------------------------------------+-----------+-------------------------------------+
 
 Note that if one is running without cooling switched on at runtime, the
-temperatures can be computed by passing the ``--temparature`` runtime flag (see
+temperatures can be computed by passing the ``--temperature`` runtime flag (see
 :ref:`cmdline-options`). Note that the tables then have to be available as in
 the case with cooling switched on.
 
@@ -341,9 +350,10 @@ implicit problem. A valid section of the YAML file looks like:
    EAGLECooling:
      dir_name:     /path/to/the/Wiersma/tables/directory # Absolute or relative path
      H_reion_z:            11.5      # Redhift of Hydrogen re-ionization
+     H_reion_ev_p_H:        2.0      # Energy injected in eV per Hydrogen atom for Hydrogen re-ionization.
      He_reion_z_centre:     3.5      # Centre of the Gaussian used for Helium re-ionization
      He_reion_z_sigma:      0.5      # Width of the Gaussian used for Helium re-ionization
-     He_reion_ev_p_H:       2.0      # Energy injected in eV per Hydrogen atom for Helium re-ionization.
+     He_reion_ev_p_H:       2.0      # Energy injected in eV per Hydrogen atom for Helium II re-ionization.
 
 And the optional parameters are:
 
@@ -384,8 +394,61 @@ the snapshots for each gas and star particle:
 
 .. _EAGLE_star_formation:
 
-Star formation: Schaye+2008
-~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Star formation: Schaye+2008 modified for EAGLE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. figure:: EAGLE_SF_Z_dep.svg
+    :width: 400px
+    :align: center
+    :figclass: align-center
+    :alt: Metal-dependance of the threshold for star formation in the
+	  EAGLE model.
+
+    The dependency of the SF threshold density on the metallicty of the gas
+    in the EAGLE model (black line). The function is described by the four
+    parameters indicated on the figure. These are the slope of the
+    dependency, its position on the metallicity-axis and normalisation
+    (black circle) as well as the maximal threshold density allowed. For
+    reference, the black arrow indicates the value typically assumed for
+    solar metallicity :math:`Z_\odot=0.014` (note, however, that this value
+    does *not* enter the model at all). The values used to produce this
+    figure are the ones assumed in the reference EAGLE model.
+
+.. figure:: EAGLE_SF_EOS.svg
+    :width: 400px
+    :align: center
+    :figclass: align-center
+    :alt: Equation-of-state assumed for the star-forming gas
+
+    The equation-of-state assumed for the star-forming gas in the EAGLE
+    model (black line). The function is described by the three parameters
+    indicated on the figure. These are the slope of the relation, the
+    position of the normalisation point on the density axis and the
+    temperature expected at this density. Note that this is a normalisation
+    and *not* a threshold. Gas at densities lower than the normalisation
+    point will also be put on this equation of state when computing its
+    star formation rate. The values used to produce this figure are the
+    ones assumed in the reference EAGLE model.
+    
+.. code:: YAML
+
+   # EAGLE star formation parameters
+   EAGLEStarFormation:
+     EOS_density_norm_H_p_cm3:          0.1       # Physical density used for the normalisation of the EOS assumed for the star-forming gas in Hydrogen atoms per cm^3.
+     EOS_temperature_norm_K:            8000      # Temperature om the polytropic EOS assumed for star-forming gas at the density normalisation in Kelvin.
+     EOS_gamma_effective:               1.3333333 # Slope the of the polytropic EOS assumed for the star-forming gas.
+     KS_normalisation:                  1.515e-4  # The normalization of the Kennicutt-Schmidt law in Msun / kpc^2 / yr.
+     KS_exponent:                       1.4       # The exponent of the Kennicutt-Schmidt law.
+     KS_min_over_density:               57.7      # The over-density above which star-formation is allowed.
+     KS_high_density_threshold_H_p_cm3: 1e3       # Hydrogen number density above which the Kennicut-Schmidt law changes slope in Hydrogen atoms per cm^3.
+     KS_high_density_exponent:          2.0       # Slope of the Kennicut-Schmidt law above the high-density threshold.
+     KS_temperature_margin_dex:         0.5       # Logarithm base 10 of the maximal temperature difference above the EOS allowed to form stars.
+     KS_max_density_threshold_H_p_cm3:  1e5       # Hydrogen number density above which a particle gets automatically turned into a star in Hydrogen atoms per cm^3.
+     threshold_norm_H_p_cm3:            0.1       # Normalisation of the metal-dependant density threshold for star formation in Hydrogen atoms per cm^3.
+     threshold_Z0:                      0.002     # Reference metallicity (metal mass fraction) for the metal-dependant threshold for star formation.
+     threshold_slope:                   -0.64     # Slope of the metal-dependant star formation threshold
+     threshold_max_density_H_p_cm3:     10.0      # Maximal density of the metal-dependant density threshold for star formation in Hydrogen atoms per cm^3.
+     gas_fraction:                      0.1       # The gas fraction used internally by the model.
 
 .. _EAGLE_enrichment:
 
diff --git a/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_SF_EOS.py b/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_SF_EOS.py
new file mode 100644
index 0000000000000000000000000000000000000000..88ca56d750bf716fea8b4bf72b70c2b598953ac7
--- /dev/null
+++ b/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_SF_EOS.py
@@ -0,0 +1,78 @@
+import matplotlib
+
+matplotlib.use("Agg")
+from pylab import *
+from scipy import stats
+
+# Plot parameters
+params = {
+    "axes.labelsize": 10,
+    "axes.titlesize": 10,
+    "font.size": 9,
+    "font.sans-serif": [
+        "Computer Modern",
+        "Computer Modern Roman",
+        "CMU Serif",
+        "cmunrm",
+        "DejaVu Sans",
+    ],
+    "mathtext.fontset": "cm",
+    "legend.fontsize": 9,
+    "xtick.labelsize": 10,
+    "ytick.labelsize": 10,
+    "text.usetex": False,
+    "figure.figsize": (3.15, 3.15),
+    "lines.markersize": 6,
+    "figure.subplot.left": 0.15,
+    "figure.subplot.right": 0.99,
+    "figure.subplot.bottom": 0.13,
+    "figure.subplot.top": 0.99,
+    "figure.subplot.wspace": 0.15,
+    "figure.subplot.hspace": 0.12,
+    "lines.linewidth": 2.0,
+}
+
+rcParams.update(params)
+
+# Equations of state
+eos_SF_rho = np.logspace(-10, 5, 1000)
+eos_SF_T = (eos_SF_rho / 10 ** (-1)) ** (1.0 / 3.0) * 8000.0
+
+# Plot the phase space diagram
+figure()
+subplot(111, xscale="log", yscale="log")
+plot(eos_SF_rho, eos_SF_T, "k-", lw=1.0)
+
+plot([1e-10, 1e-1], [8000, 8000], "k:", lw=0.6)
+plot([1e-1, 1e-1], [20, 8000], "k:", lw=0.6)
+plot([1e-1, 1e1], [20000.0, 20000.0 * 10.0 ** (2.0 / 3.0)], "k--", lw=0.6)
+text(
+    0.5e-1,
+    200000,
+    "$n_{\\rm H}$^EOS_gamma_effective",
+    va="top",
+    rotation=43,
+    fontsize=6.5,
+    family="monospace",
+)
+text(
+    0.95e-1,
+    25,
+    "EOS_density_norm_H_p_cm3",
+    rotation=90,
+    va="bottom",
+    ha="right",
+    fontsize=7,
+    family="monospace",
+)
+text(5e-8, 8400, "EOS_temperature_norm_K", va="bottom", fontsize=7, family="monospace")
+
+scatter([1e-1], [8000], s=4, color="k")
+
+xlabel("Hydrogen number density $n_{\\rm H}$ [cm$^{-3}$]", labelpad=0)
+ylabel("Temperature $T$ [K]", labelpad=2)
+xlim(3e-8, 3e3)
+ylim(20.0, 2e5)
+
+
+savefig("EAGLE_SF_EOS.svg", dpi=200)
diff --git a/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_SF_Z_dep.py b/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_SF_Z_dep.py
new file mode 100644
index 0000000000000000000000000000000000000000..26ae522947ecc9e75f6f287bafed0bb9acb9134a
--- /dev/null
+++ b/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_SF_Z_dep.py
@@ -0,0 +1,99 @@
+import matplotlib
+
+matplotlib.use("Agg")
+from pylab import *
+from scipy import stats
+
+# Plot parameters
+params = {
+    "axes.labelsize": 10,
+    "axes.titlesize": 10,
+    "font.size": 9,
+    "font.sans-serif": [
+        "Computer Modern",
+        "Computer Modern Roman",
+        "CMU Serif",
+        "cmunrm",
+        "DejaVu Sans",
+    ],
+    "mathtext.fontset": "cm",
+    "legend.fontsize": 9,
+    "xtick.labelsize": 10,
+    "ytick.labelsize": 10,
+    "text.usetex": False,
+    "figure.figsize": (3.15, 3.15),
+    "lines.markersize": 6,
+    "figure.subplot.left": 0.15,
+    "figure.subplot.right": 0.99,
+    "figure.subplot.bottom": 0.13,
+    "figure.subplot.top": 0.99,
+    "figure.subplot.wspace": 0.15,
+    "figure.subplot.hspace": 0.12,
+    "lines.linewidth": 2.0,
+}
+
+rcParams.update(params)
+
+# Metal dependance parameters
+Z_0 = 0.002
+norm = 0.1
+slope = -0.64
+max_n = 10.0
+
+# Function
+Z = logspace(-8, 3, 1000)
+n = norm * (Z / Z_0) ** slope
+n = np.minimum(n, np.ones(np.size(n)) * (max_n))
+
+
+# Plot the phase space diagram
+figure()
+subplot(111, xscale="log", yscale="log")
+
+plot(Z, n, "k-", lw=1.0)
+
+plot([3e-4, 3e-2], [1.0, 1.0 * 100.0 ** (slope)], "k--", lw=0.6)
+plot([1e-10, 1e10], [max_n, max_n], "k:", lw=0.6)
+plot([Z_0, Z_0], [1e-10, norm], "k:", lw=0.6)
+plot([1e-10, Z_0], [norm, norm], "k:", lw=0.6)
+scatter([Z_0], [norm], s=4, color="k")
+
+annotate(
+    "",
+    xy=(0.014, 1e-3),
+    xytext=(0.014, 3e-4),
+    arrowprops=dict(
+        facecolor="black", shrink=0.0, width=0.1, headwidth=3.0, headlength=5.0
+    ),
+)
+text(0.016, 3.5e-4, "${Z_\\odot}$", fontsize=9)
+
+text(
+    3e-4,
+    1.45,
+    "Z^threshold_slope",
+    va="top",
+    rotation=-40,
+    fontsize=7,
+    family="monospace",
+)
+text(3e-5, 12.0, "threshold_max_density_H_p_cm3", fontsize=7, family="monospace")
+text(3e-7, 0.12, "threshold_norm_H_p_cm3", fontsize=7, family="monospace")
+text(
+    0.0018,
+    0.0004,
+    "threshold_Z0",
+    rotation=90,
+    va="bottom",
+    ha="right",
+    fontsize=7,
+    family="monospace",
+)
+
+xlabel("Metallicity (metal mass fraction) $Z$ [-]", labelpad=2)
+ylabel("SF threshold number density $n_{\\rm H, thresh}$ [cm$^{-3}$]", labelpad=-1)
+
+xlim(1e-7, 1.0)
+ylim(0.0002, 50)
+
+savefig("EAGLE_SF_Z_dep.svg", dpi=200)
diff --git a/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_entropy_floor.py b/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_entropy_floor.py
index 5b02dd657fdb32e411961f04d0d758119344b809..1e7dad6c95211a8e43805a904fb8d9901305b692 100644
--- a/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_entropy_floor.py
+++ b/doc/RTD/source/SubgridModels/EAGLE/plot_EAGLE_entropy_floor.py
@@ -1,4 +1,5 @@
 import matplotlib
+
 matplotlib.use("Agg")
 from pylab import *
 from scipy import stats
@@ -8,53 +9,97 @@ params = {
     "axes.labelsize": 10,
     "axes.titlesize": 10,
     "font.size": 9,
+    "font.sans-serif": [
+        "Computer Modern",
+        "Computer Modern Roman",
+        "CMU Serif",
+        "cmunrm",
+        "DejaVu Sans",
+    ],
+    "mathtext.fontset": "cm",
     "legend.fontsize": 9,
     "xtick.labelsize": 10,
     "ytick.labelsize": 10,
-    "text.usetex": True,
+    "text.usetex": False,
     "figure.figsize": (3.15, 3.15),
+    "lines.markersize": 6,
     "figure.subplot.left": 0.15,
     "figure.subplot.right": 0.99,
     "figure.subplot.bottom": 0.13,
     "figure.subplot.top": 0.99,
     "figure.subplot.wspace": 0.15,
     "figure.subplot.hspace": 0.12,
-    "lines.markersize": 6,
     "lines.linewidth": 2.0,
-    "text.latex.unicode": True,
 }
+
 rcParams.update(params)
-rc("font", **{"family": "sans-serif", "sans-serif": ["Times"]})
 
 # Equations of state
 eos_cool_rho = np.logspace(-5, 5, 1000)
-eos_cool_T = eos_cool_rho**0. * 8000.
+eos_cool_T = eos_cool_rho ** 0.0 * 8000.0
 eos_Jeans_rho = np.logspace(-1, 5, 1000)
-eos_Jeans_T = (eos_Jeans_rho/ 10**(-1))**(1./3.) * 4000.
+eos_Jeans_T = (eos_Jeans_rho / 10 ** (-1)) ** (1.0 / 3.0) * 4000.0
 
 # Plot the phase space diagram
 figure()
 subplot(111, xscale="log", yscale="log")
-plot(eos_cool_rho, eos_cool_T, 'k-', lw=1.)
-plot(eos_Jeans_rho, eos_Jeans_T, 'k-', lw=1.)
-plot([1e-10, 1e-5], [8000, 8000], 'k:', lw=0.6)
-plot([1e-10, 1e-1], [4000, 4000], 'k:', lw=0.6)
-plot([1e-5, 1e-5], [20, 8000], 'k:', lw=0.6)
-plot([1e-1, 1e-1], [20, 4000], 'k:', lw=0.6)
-plot([3e-6, 3e-4], [28000, 28000], 'k--', lw=0.6)
-text(3e-6, 22500, "$n_{\\rm H}~\\widehat{}~{\\tt Cool\\_gamma\\_effective}$", va="top", fontsize=7)
-plot([3e-1, 3e1], [15000., 15000.*10.**(2./3.)], 'k--', lw=0.6)
-text(3e-1, 200000, "$n_{\\rm H}~\\widehat{}~{\\tt Jeans\\_gamma\\_effective}$", va="top", rotation=43, fontsize=7)
-text(0.95e-5, 25, "${\\tt Cool\\_density\\_threshold\\_H\\_p\\_cm3}$", rotation=90, va="bottom", ha="right", fontsize=7)
-text(0.95e-1, 25, "${\\tt Jeans\\_density\\_threshold\\_H\\_p\\_cm3}$", rotation=90, va="bottom", ha="right", fontsize=7)
-text(5e-8, 8800, "${\\tt Cool\\_temperature\\_norm\\_K}$", va="bottom", fontsize=7)
-text(5e-8, 4400, "${\\tt Jeans\\_temperature\\_norm\\_K}$", va="bottom", fontsize=7)
-fill_between([1e-5, 1e5], [10, 10], [8000, 8000], color='0.9')
-fill_between([1e-1, 1e5], [4000, 400000], color='0.9')
-scatter([1e-5], [8000], s=4, color='k')
-scatter([1e-1], [4000], s=4, color='k')
-xlabel("${\\rm Density}~n_{\\rm H}~[{\\rm cm^{-3}}]$", labelpad=0)
-ylabel("${\\rm Temperature}~T~[{\\rm K}]$", labelpad=2)
+plot(eos_cool_rho, eos_cool_T, "k-", lw=1.0)
+plot(eos_Jeans_rho, eos_Jeans_T, "k-", lw=1.0)
+plot([1e-10, 1e-5], [8000, 8000], "k:", lw=0.6)
+plot([1e-10, 1e-1], [4000, 4000], "k:", lw=0.6)
+plot([1e-5, 1e-5], [20, 8000], "k:", lw=0.6)
+plot([1e-1, 1e-1], [20, 4000], "k:", lw=0.6)
+plot([3e-6, 3e-4], [28000, 28000], "k--", lw=0.6)
+
+text(
+    3e-6,
+    22500,
+    "$n_{\\rm H}$^Cool_gamma_effective",
+    va="top",
+    fontsize=6,
+    family="monospace",
+)
+plot([3e-1, 3e1], [15000.0, 15000.0 * 10.0 ** (2.0 / 3.0)], "k--", lw=0.6)
+text(
+    3e-1,
+    200000,
+    "$n_{\\rm H}$^Jeans_gamma_effective",
+    va="top",
+    rotation=43,
+    fontsize=6,
+    family="monospace",
+)
+text(
+    0.95e-5,
+    23,
+    "Cool_density_threshold_H_p_cm3",
+    rotation=90,
+    va="bottom",
+    ha="right",
+    fontsize=6,
+    family="monospace",
+)
+text(
+    0.95e-1,
+    23,
+    "Jeans_density_threshold_H_p_cm3",
+    rotation=90,
+    va="bottom",
+    ha="right",
+    fontsize=5.5,
+    family="monospace",
+)
+text(5e-8, 8800, "Cool_temperature_norm_K", va="bottom", fontsize=6, family="monospace")
+text(
+    5e-8, 4400, "Jeans_temperature_norm_K", va="bottom", fontsize=6, family="monospace"
+)
+fill_between([1e-5, 1e5], [10, 10], [8000, 8000], color="0.9")
+fill_between([1e-1, 1e5], [4000, 400000], color="0.9")
+scatter([1e-5], [8000], s=4, color="k")
+scatter([1e-1], [4000], s=4, color="k")
+xlabel("Hydrogen number density $n_{\\rm H}$ [cm$^{-3}$]", labelpad=0)
+ylabel("Temperature $T$ [K]", labelpad=2)
 xlim(3e-8, 3e3)
-ylim(20., 2e5)
-savefig("EAGLE_entropy_floor.png", dpi=200)
+ylim(20.0, 2e5)
+
+savefig("EAGLE_entropy_floor.svg", dpi=200)
diff --git a/doc/RTD/source/Task/index.rst b/doc/RTD/source/Task/index.rst
index 82210895618618f87faaada472c72afe321b1d04..549a89c834570c45e7b4233f3c412fe8afba226d 100644
--- a/doc/RTD/source/Task/index.rst
+++ b/doc/RTD/source/Task/index.rst
@@ -9,11 +9,8 @@ Task System
 This section of the documentation includes information on the task system
 available in SWIFT, as well as how to implement your own task.
 
-SWIFT can produce a graph containing all the dependencies using graphviz.
-At the beginning of each simulation a ``csv`` file is generated and can be transformed into a ``png`` with the script ``tools/plot_task_dependencies.py``.
-This script has also the possibility to generate a list of function calls for each task with the option ``--with-calls``.
-You can convert the ``dot`` file into a ``png`` with the following command
-``dot -Tpng dependency_graph.dot -o dependency_graph.png`` or directly read it with the python module ``xdot`` with ``python -m xdot dependency_graph.dot``.
+SWIFT can produce a graph containing all the dependencies.
+Everything is described in :ref:`_analysistools`.
 
 
 .. toctree::
diff --git a/doc/RTD/source/conf.py b/doc/RTD/source/conf.py
index fac755bbb4ee9cd25bf3526bc435c69be3a9d5b5..327c5524820772c4c891418cff72a3c22a4fb2b0 100644
--- a/doc/RTD/source/conf.py
+++ b/doc/RTD/source/conf.py
@@ -25,7 +25,7 @@ author = 'SWIFT Team'
 # The short X.Y version
 version = '0.8'
 # The full version, including alpha/beta/rc tags
-release = '0.8.0'
+release = '0.8.1'
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/doc/RTD/source/index.rst b/doc/RTD/source/index.rst
index 83422b4e5caf05bacb3824d06426b9cdeba3921e..b7c4205b0ac45680ee14e4a3941f03d116ab8c69 100644
--- a/doc/RTD/source/index.rst
+++ b/doc/RTD/source/index.rst
@@ -26,3 +26,4 @@ difference is the parameter file that will need to be adapted for SWIFT.
    NewOption/index
    Task/index
    VELOCIraptorInterface/index
+   AnalysisTools/index
diff --git a/examples/Cooling/ConstantCosmoTempEvolution/README b/examples/Cooling/ConstantCosmoTempEvolution/README
new file mode 100644
index 0000000000000000000000000000000000000000..1ca1c87c06337fb3b44dfdf0227e99da3b79fdd0
--- /dev/null
+++ b/examples/Cooling/ConstantCosmoTempEvolution/README
@@ -0,0 +1,18 @@
+This example runs a cosmological simulation using 32^3 particles with
+the gas density set to the mean baryonic density and no fluctuations
+(i.e. sigma_8 == 0). The simulation is run without gravity to prevent
+any numerical fluctuation from growing. 
+
+The gas is cooling/heating via its interaction with the UV background
+set by the cooling model. In practice, the gas will follow the
+equilibirum temperature of the model at all z and only be affected by
+reionization. Assuming primoridal abundance, the temperature of the
+gas at different redshifts can be compared to temperatures inferred
+from observations of the Lyman-alpha forrest. The plotting script runs
+this comparison once the simulation has completed.
+
+Within the EAGLE cooling model, interesting changes are to switch
+on/off the Helium II reionisation (or change its redshift) as well as
+the position and amount of energy injected by Hydrogen
+reionisation. The parameters given the YAML file are the ones used for
+actual EAGLE galaxy formation runs.
diff --git a/examples/Cooling/ConstantCosmoTempEvolution/const_cosmo_temp_evol.yml b/examples/Cooling/ConstantCosmoTempEvolution/const_cosmo_temp_evol.yml
new file mode 100644
index 0000000000000000000000000000000000000000..01dcbc96fd329f53b1fd345bc198b05a53861982
--- /dev/null
+++ b/examples/Cooling/ConstantCosmoTempEvolution/const_cosmo_temp_evol.yml
@@ -0,0 +1,77 @@
+# Define the system of units to use internally. 
+InternalUnitSystem:
+  UnitMass_in_cgs:     1.98848e43    # 10^10 M_sun
+  UnitLength_in_cgs:   3.08567758e24 # 1 Mpc
+  UnitVelocity_in_cgs: 1e5   	     # 1 km/s
+  UnitCurrent_in_cgs:  1   	     # Amperes
+  UnitTemp_in_cgs:     1   	     # Kelvin
+
+# Cosmological parameters
+Cosmology:
+  h:              0.6777        # Reduced Hubble constant
+  a_begin:        0.0099        # Initial scale-factor of the simulation (z = 100.0)
+  a_end:          1.0           # Final scale factor of the simulation
+  Omega_m:        0.307         # Matter density parameter
+  Omega_lambda:   0.693         # Dark-energy density parameter
+  Omega_b:        0.0455        # Baryon density parameter
+
+# Parameters governing the time integration
+TimeIntegration:
+  dt_min:     1e-7
+  dt_max:     5e-3
+
+# Parameters governing the snapshots
+Snapshots:
+  basename:	       cooling_box
+  delta_time:          1.04
+  scale_factor_first:  0.00991
+  compression:         4
+
+# Parameters governing the conserved quantities statistics
+Statistics:
+  scale_factor_first:  0.00991
+  delta_time:          1.1
+
+# Parameters for the hydrodynamics scheme
+SPH:
+  resolution_eta:        1.2348   # Target smoothing length in units of the mean inter-particle separation (1.2348 == 48Ngbs with the cubic spline kernel).
+  CFL_condition:         0.1      # Courant-Friedrich-Levy condition for time integration.
+  minimal_temperature:   100      # K
+  
+# Parameters related to the initial conditions
+InitialConditions:
+  file_name:  ./constantBox.hdf5     # The file to read
+  periodic:   1
+
+# Parameters for the EAGLE chemistry
+EAGLEChemistry: 	     # Solar abundances
+  init_abundance_metal:      0.
+  init_abundance_Hydrogen:   0.752
+  init_abundance_Helium:     0.248
+  init_abundance_Carbon:     0.
+  init_abundance_Nitrogen:   0.
+  init_abundance_Oxygen:     0.
+  init_abundance_Neon:       0.
+  init_abundance_Magnesium:  0.
+  init_abundance_Silicon:    0.
+  init_abundance_Iron:       0.
+
+# Parameters for the EAGLE cooling
+EAGLECooling:
+  dir_name:                ./coolingtables/
+  H_reion_z:               11.5 
+  H_reion_eV_p_H:          2.0
+  He_reion_z_centre:       3.5
+  He_reion_z_sigma:        0.5
+  He_reion_eV_p_H:         2.0
+  
+# Parameters for the EAGLE "equation of state"
+EAGLEEntropyFloor:
+  Jeans_density_threshold_H_p_cm3: 0.1       # Physical density above which the EAGLE Jeans limiter entropy floor kicks in expressed in Hydrogen atoms per cm^3.
+  Jeans_over_density_threshold:    10.       # Overdensity above which the EAGLE Jeans limiter entropy floor can kick in.
+  Jeans_temperature_norm_K:        8000      # Temperature of the EAGLE Jeans limiter entropy floor at the density threshold expressed in Kelvin.
+  Jeans_gamma_effective:           1.3333333 # Slope the of the EAGLE Jeans limiter entropy floor
+  Cool_density_threshold_H_p_cm3: 1e-5       # Physical density above which the EAGLE Cool limiter entropy floor kicks in expressed in Hydrogen atoms per cm^3.
+  Cool_over_density_threshold:    10.        # Overdensity above which the EAGLE Cool limiter entropy floor can kick in.
+  Cool_temperature_norm_K:        8000       # Temperature of the EAGLE Cool limiter entropy floor at the density threshold expressed in Kelvin.
+  Cool_gamma_effective:           1.         # Slope the of the EAGLE Cool limiter entropy floor
diff --git a/examples/Cooling/ConstantCosmoTempEvolution/datasets/schaye_et_al_2000_thermal_history.dat b/examples/Cooling/ConstantCosmoTempEvolution/datasets/schaye_et_al_2000_thermal_history.dat
new file mode 100644
index 0000000000000000000000000000000000000000..11c58fbc3255640b11269a95b9c7f00fc30fb4b1
--- /dev/null
+++ b/examples/Cooling/ConstantCosmoTempEvolution/datasets/schaye_et_al_2000_thermal_history.dat
@@ -0,0 +1,18 @@
+### Data from Figure 6 in Schaye et al. (2000) (2000MNRAS.318..817S)
+# z ########## z_lb ######### z_ub ######## T_0/1e4K ##### T_0_lb/1e4K ## T_0_ub/1e4K
+1.95804        1.84615        2.08042        1.09915        0.76847        2.27999
+2.20979        2.09790        2.32867        1.40112        0.90638        1.98188
+2.28322        2.22378        2.37762        1.19902        1.01236        1.36980
+2.49650        2.33217        2.62238        1.39889        1.15520        1.74657
+2.59441        2.48601        2.70629        1.60171        1.44953        1.76021
+2.65385        2.54895        2.87762        2.29650        1.57475        2.44105
+2.83916        2.70629        2.94056        1.72395        1.43950        2.30056
+3.00000        2.88462        3.13636        2.28574        1.89278        2.71473
+3.07343        2.90210        3.21329        2.01108        1.88150        2.13172
+3.23427        3.14685        3.41259        2.26386        1.40872        3.34756
+3.36014        3.22378        3.51748        1.53842        1.39604        1.69997
+3.54545        3.43007        3.69930        1.08649        0.88238        1.39077
+3.72028        3.61189        3.81469        1.25736        1.08243        1.62749
+3.83217        3.68531        4.01399        1.32092        1.03191        1.74809
+3.90909        3.81469        4.00350        1.55086        1.14616        2.01291
+4.30420        4.14685        4.42657        1.15002        0.92882        2.01412
diff --git a/examples/Cooling/ConstantCosmoTempEvolution/datasets/walther_et_al_2019_thermal_history.dat b/examples/Cooling/ConstantCosmoTempEvolution/datasets/walther_et_al_2019_thermal_history.dat
new file mode 100644
index 0000000000000000000000000000000000000000..d11c770a710f970d50c08aa58db705018eb29aed
--- /dev/null
+++ b/examples/Cooling/ConstantCosmoTempEvolution/datasets/walther_et_al_2019_thermal_history.dat
@@ -0,0 +1,18 @@
+### Data from Figure 13 in Walther et al. (2019) (2019ApJ...872...13W)
+# z ######### T_0/1e4K ##### T_0_lb/1e4K ## T_0_ub/1e4K ########
+1.7793        0.77828        0.56109        1.1403 
+1.9793        0.74208        0.65158        0.90950
+2.1793        1.0226         0.87330        1.2715 
+2.3793        1.1719         0.98190        1.4570 
+2.5793        1.2398         1.0995         1.4299 
+2.7793        1.2941         1.1493         1.4796 
+2.9793        1.3032         1.1538         1.4887 
+3.1793        1.1900         1.0724         1.3258 
+3.3770        1.4118         1.2443         1.6109 
+3.5770        1.0452         0.78281        1.3575 
+3.7770        1.2081         1.0181         1.4344 
+3.9770        0.95023        0.77828        1.1674 
+4.1770        0.89593        0.82805        0.99095
+4.5770        0.88688        0.77828        1.0136 
+4.9770        0.54299        0.45701        0.66516
+5.3747        0.61086        0.47511        0.76018
diff --git a/examples/Cooling/ConstantCosmoTempEvolution/getGlass.sh b/examples/Cooling/ConstantCosmoTempEvolution/getGlass.sh
new file mode 100755
index 0000000000000000000000000000000000000000..01b4474ac21666c843b7abedfa39a76948934911
--- /dev/null
+++ b/examples/Cooling/ConstantCosmoTempEvolution/getGlass.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+wget http://virgodb.cosma.dur.ac.uk/swift-webstorage/ICs/gravity_glassCube_32.hdf5
diff --git a/examples/Cooling/ConstantCosmoTempEvolution/makeIC.py b/examples/Cooling/ConstantCosmoTempEvolution/makeIC.py
new file mode 100644
index 0000000000000000000000000000000000000000..c6ae39206e14770df590efb2d2d468bfc5c088fb
--- /dev/null
+++ b/examples/Cooling/ConstantCosmoTempEvolution/makeIC.py
@@ -0,0 +1,84 @@
+################################################################################
+# This file is part of SWIFT.
+# Copyright (c) 2019 Stefan Arridge (stefan.arridge@durham.ac.uk)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+
+from swiftsimio import Writer
+from swiftsimio.units import cosmo_units
+
+import unyt
+import numpy as np
+import h5py as h5
+
+
+# Parameters
+boxsize = 100 * unyt.Mpc
+T_i = 1000.0  # Initial temperature of the gas (in K)
+z_i = 100.0  # Initial redshift
+gamma = 5.0 / 3.0  # Gas adiabatic index
+n_p_1D = 32
+glassFile = "gravity_glassCube_32.hdf5"
+filename = "constantBox.hdf5"
+
+# Cosmology (must be same as param file)
+hubble_param = 0.6777  # same as in param file
+Omega_bar = 0.0455  # same as in param file
+
+
+# Read the glass file
+glass = h5.File(glassFile, "r")
+
+# Total number of particles
+n_p = n_p_1D ** 3
+# Read particle positions and from the glass
+glass_pos = glass["/PartType1/Coordinates"][:, :]
+glass.close()
+
+# Calculate mean baryon density today from comological parameters
+H_0 = 100.0 * hubble_param * unyt.km / unyt.s / unyt.Mpc
+rho_crit_0 = 3.0 * H_0 ** 2 / (8.0 * np.pi * unyt.G)
+rho_bar_0 = Omega_bar * rho_crit_0 
+
+# From this, we calculate the mass of the gas particles
+gas_particle_mass = rho_bar_0 * boxsize ** 3 / (n_p_1D ** 3)
+
+# Generate object. cosmo_units corresponds to default Gadget-oid units
+# of 10^10 Msun, Mpc, and km/s
+x = Writer(cosmo_units, boxsize)
+
+# 32^3 particles.
+n_p = 32 ** 3
+
+# Make gas coordinates from 0, 100 Mpc in each direction
+x.gas.coordinates = glass_pos * boxsize
+
+# Random velocities from 0 to 1 km/s
+x.gas.velocities = np.zeros((n_p, 3)) * (unyt.km / unyt.s)
+
+# Generate uniform masses as 10^6 solar masses for each particle
+x.gas.masses = np.ones(n_p, dtype=float) * gas_particle_mass
+
+# Generate internal energy corresponding to 10^4 K
+x.gas.internal_energy = (
+    np.ones(n_p, dtype=float) * (T_i * unyt.kb * unyt.K) / (1e6 * unyt.msun)
+)
+
+# Generate initial guess for smoothing lengths based on MIPS
+x.gas.generate_smoothing_lengths(boxsize=boxsize, dimension=3)
+
+# If IDs are not present, this automatically generates
+x.write(filename)
diff --git a/examples/Cooling/ConstantCosmoTempEvolution/plot_thermal_history.py b/examples/Cooling/ConstantCosmoTempEvolution/plot_thermal_history.py
new file mode 100644
index 0000000000000000000000000000000000000000..1494102531104b252e3edaa467920db7383ac6e6
--- /dev/null
+++ b/examples/Cooling/ConstantCosmoTempEvolution/plot_thermal_history.py
@@ -0,0 +1,184 @@
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+import h5py as h5
+import swiftsimio
+import sys
+import glob
+import unyt
+import numpy as np
+
+## read command line arguments
+snapshot_name = sys.argv[1]
+
+params = {'axes.labelsize': 10,
+'axes.titlesize': 10,
+'font.size': 9,
+'legend.fontsize': 9,
+'xtick.labelsize': 10,
+'ytick.labelsize': 10,
+'text.usetex': False,
+'figure.figsize' : (4.15,3.15),
+'figure.subplot.left'    : 0.12,
+'figure.subplot.right'   : 0.99,
+'figure.subplot.bottom'  : 0.12,
+'figure.subplot.top'     : 0.99,
+'figure.subplot.wspace'  : 0.15,
+'figure.subplot.hspace'  : 0.12,
+'lines.markersize' : 6,
+'lines.linewidth' : 2.,
+'text.latex.unicode': True
+}
+plt.rcParams.update(params)
+
+################# Read in observational data
+
+data_schaye = np.genfromtxt("./datasets/schaye_et_al_2000_thermal_history.dat",skip_header = 2)
+data_walther = np.genfromtxt("./datasets/walther_et_al_2019_thermal_history.dat",skip_header = 2)
+
+data_schaye = data_schaye.T
+data_walther = data_walther.T
+
+schaye_z_lower_error = data_schaye[0] - data_schaye[1]
+schaye_z_upper_error = data_schaye[2] - data_schaye[0]
+schaye_T_lower_error = np.log10(data_schaye[3]*1.0e4) - np.log10(data_schaye[4]*1.0e4)
+schaye_T_upper_error = np.log10(data_schaye[5]*1.0e4) - np.log10(data_schaye[3]*1.0e4)
+walther_T_lower_error = np.log10(data_walther[1]*1.0e4) - np.log10(data_walther[2]*1.0e4)
+walther_T_upper_error = np.log10(data_walther[3]*1.0e4) - np.log10(data_walther[1]*1.0e4)
+
+############### Read in simulation data
+
+## First, get list of all snapshots
+reg_exp = "%s*.hdf5" %snapshot_name
+snap_list = glob.glob(reg_exp)
+
+z = []
+T_mean = []
+T_std = []
+rho_mean = []
+rho_std = []
+
+## loop through list
+for snap in snap_list:
+    
+    # This loads all metadata but explicitly does _not_ read any particle data yet
+    data = swiftsimio.load(snap)
+
+    # Get the redshift
+    z = np.append(z, data.metadata.z)
+        
+    # Convert gas temperatures and densities to right units
+    data.gas.temperature.convert_to_cgs()
+
+    # Get mean and standard deviation of temperature
+    T_mean.append(np.mean(data.gas.temperature) * data.gas.temperature.units)
+    T_std.append(np.std(data.gas.temperature) * data.gas.temperature.units)
+
+    # Get mean and standard deviation of density
+    rho_mean.append(np.mean(data.gas.density) * data.gas.density.units)
+    rho_std.append(np.std(data.gas.density) * data.gas.density.units)
+    
+## Turn into numpy arrays
+T_mean = np.array(T_mean) * data.gas.temperature.units
+T_std = np.array(T_std) * data.gas.temperature.units
+rho_mean = np.array(rho_mean) * data.gas.density.units
+rho_std = np.array(rho_std) * data.gas.density.units
+
+## Put Density into units of mean baryon density today
+
+# first calculate rho_bar_0 from snapshot metadata
+### from the first snapshot, get cosmology information
+d = swiftsimio.load(snap_list[0])
+cosmology = d.metadata.cosmology
+H0 = cosmology["H0 [internal units]"] / (d.units.time)
+Omega_bar = cosmology["Omega_b"]
+
+### now calculate rho_bar_0 and divide through
+rho_bar_0 = 3.0 * H0**2 / (8. * np.pi * unyt.G) * Omega_bar 
+rho_mean /= rho_bar_0
+rho_std /= rho_bar_0
+
+### sort arrays into redshift order
+ind_sorted = np.argsort(z)
+z = z[ind_sorted]
+T_mean = T_mean[ind_sorted]
+T_std = T_std[ind_sorted]
+rho_mean = rho_mean[ind_sorted]
+rho_std = rho_std[ind_sorted]
+
+### from the first snapshot, get code information
+d = swiftsimio.load(snap_list[0])
+code_info = d.metadata.code
+git_branch = code_info["Git Branch"].decode('UTF-8')
+git_revision = code_info["Git Revision"].decode('UTF-8')
+hydro_metadata = d.metadata.hydro_scheme
+scheme = hydro_metadata["Scheme"].decode('UTF-8')
+params = d.metadata.parameters
+
+subgrid_metadata = d.metadata.subgrid_scheme
+cooling_model = subgrid_metadata["Cooling Model"].decode('UTF-8')
+chemistry_model = subgrid_metadata["Chemistry Model"].decode('UTF-8')
+
+if cooling_model == 'EAGLE':
+    z_r_H = float(params['EAGLECooling:H_reion_z'])
+    H_heat_input = float(params['EAGLECooling:H_reion_eV_p_H'])
+    z_r_He_centre = float(params['EAGLECooling:He_reion_z_centre'])
+    z_r_He_sigma = float(params['EAGLECooling:He_reion_z_sigma'])
+    He_heat_input = float(params['EAGLECooling:He_reion_eV_p_H'])
+
+metallicity = "Unknown"
+if chemistry_model == 'EAGLE':
+    metallicity = float(params['EAGLEChemistry:init_abundance_metal'])
+    
+# Make plot of temperature evolution  --------------------------------
+fig = plt.figure()
+
+# Plot sim properties
+if cooling_model == 'EAGLE':
+    plt.plot([z_r_H, z_r_H], [3.4, 4.4], 'k--', alpha=0.5, lw=0.7)
+    plt.text(z_r_H + 0.1, 3.55, "H reion.", rotation=90, alpha=0.5, fontsize=7, va="bottom")
+    plt.plot([z_r_He_centre, z_r_He_centre], [3.4, 4.4], 'k--', alpha=0.5, lw=0.7)
+    plt.text(z_r_He_centre + 0.1, 3.55, "HeII reion.", rotation=90, alpha=0.5, fontsize=7, va="bottom")
+    
+# Plot observational data
+plt.errorbar(data_schaye[0],
+             np.log10(data_schaye[3]*1.0e4),
+             xerr = [schaye_z_lower_error,schaye_z_upper_error],
+             yerr = [schaye_T_lower_error,schaye_T_upper_error],
+             fmt='s', mec='0.3', color='0.3', markersize=4, markeredgewidth=0.5, linewidth=0.5, mfc='w', label="Schaye et al. (2000)")
+plt.errorbar(data_walther[0],
+             np.log10(data_walther[1]*1.0e4),
+             yerr = [walther_T_lower_error,walther_T_upper_error],
+              fmt='.', mec='0.3', color='0.3', markersize=7, markeredgewidth=0.5, linewidth=0.5, mfc='w', label = "Walther et al. (2019)")
+
+# Plot simulation
+plt.plot(z, np.log10(T_mean))
+
+# Legend
+plt.legend(loc="upper right", frameon=True, fontsize=8, handletextpad=0.1, facecolor="w", edgecolor="w", framealpha=1.)
+plt.text(0.2, 4.8, "SWIFT %s \nCooling model: %s \n$\\rho=%.3f$ $\\Omega_{b}\\rho_{crit,0}$\n$Z=%s$"%(git_revision, cooling_model, rho_mean[-1], metallicity), va="top", ha="left", fontsize=8)
+
+plt.xlim(0, 12.2)
+plt.ylim(3.5,4.85)
+plt.xlabel("Redshift", labelpad=-0.5)
+plt.ylabel(r"$\log_{10}(T/K)$", labelpad=0)
+plt.savefig("Temperature_evolution.png", dpi=200)
+
+
+# Make plot of denisty evolution  --------------------------------
+plt.rcParams.update({'figure.subplot.left'    : 0.14})
+fig = plt.figure()
+
+plt.text(0.2, 1.011, "SWIFT %s"%git_revision, va="top", ha="left", fontsize=8)
+
+plt.fill_between(z,rho_mean - rho_std,rho_mean + rho_std,alpha = 0.5)
+plt.plot(z,rho_mean)
+
+plt.axhline(y = 1.0, linestyle = '--', color='k', alpha=0.5, lw=1.)
+
+plt.xlim(0.0,12.2)
+plt.ylabel(r"$\delta_b = \rho / \Omega_b\rho_{crit,0}$", labelpad=0.)
+plt.ylim(0.988,1.012)
+plt.yticks([0.99, 1., 1.01])
+plt.xlabel("Redshift", labelpad=-0.5)
+plt.savefig("Density_evolution.png", dpi=200)
diff --git a/examples/Cooling/ConstantCosmoTempEvolution/run.sh b/examples/Cooling/ConstantCosmoTempEvolution/run.sh
new file mode 100755
index 0000000000000000000000000000000000000000..710613ec9a431a007ed7b83e2d5634ee24eea7ec
--- /dev/null
+++ b/examples/Cooling/ConstantCosmoTempEvolution/run.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# Generate the initial conditions if they are not present.
+if [ ! -e gravity_glassCube_32.hdf5 ]
+then
+    echo "Fetching initial gravity glass file for the constant cosmological box example..."
+    ./getGlass.sh
+fi
+if [ ! -e coolingtables ]
+then
+    echo "Fetching EAGLE Cooling Tables"
+    ../getEagleCoolingTable.sh
+fi
+
+# Fetch the cooling tables
+if [ ! -e constantBox.hdf5 ]
+then
+    echo "Generating initial conditions for the uniform cosmo box example..."
+    python3 makeIC.py
+fi
+
+# Run SWIFT
+../../swift --hydro --cosmology --cooling --threads=4 const_cosmo_temp_evol.yml 2>&1 | tee output.log
+
+# Plot the result
+python3 plot_thermal_history.py cooling_box
diff --git a/examples/Cooling/CoolingBox/coolingBox.yml b/examples/Cooling/CoolingBox/coolingBox.yml
index 853e480cd4ffba4baa659232e6d5f068b4ea2815..ca97793aa9b4de43872db38f55c4060a2b27ddc9 100644
--- a/examples/Cooling/CoolingBox/coolingBox.yml
+++ b/examples/Cooling/CoolingBox/coolingBox.yml
@@ -57,6 +57,7 @@ GearChemistry:
 EAGLECooling:
   dir_name:                ./coolingtables/
   H_reion_z:               11.5
+  H_reion_eV_p_H:          2.0
   He_reion_z_center:       3.5
   He_reion_z_sigma:        0.5
   He_reion_eV_p_H:         2.0
diff --git a/examples/Cooling/CoolingRates/cooling_rates.c b/examples/Cooling/CoolingRates/cooling_rates.c
index e7ff0340853e5cd5361286bd8af5c547681b4f63..f23a987e3ae56db0811eb9997a8c1c48772f7f09 100644
--- a/examples/Cooling/CoolingRates/cooling_rates.c
+++ b/examples/Cooling/CoolingRates/cooling_rates.c
@@ -166,6 +166,7 @@ int main(int argc, char **argv) {
   struct phys_const internal_const;
   struct cooling_function_data cooling;
   struct cosmology cosmo;
+  struct space s;
   const char *parametersFileName = "./cooling_rates.yml";
 
   /* Initialize CPU frequency, this also starts time. */
@@ -229,7 +230,7 @@ int main(int argc, char **argv) {
   // Init cooling
   cooling_init(params, &us, &internal_const, &cooling);
   cooling_print(&cooling);
-  cooling_update(&cosmo, &cooling);
+  cooling_update(&cosmo, &cooling, &s);
 
   // Calculate abundance ratios
   float abundance_ratio[(chemistry_element_count + 2)];
diff --git a/examples/Cooling/CoolingRates/cooling_rates.yml b/examples/Cooling/CoolingRates/cooling_rates.yml
index 1d67ad0af79368c39c24879b101a540d0bccb3d1..985eef220b24bd398deec09ea56630118d0bc5ab 100644
--- a/examples/Cooling/CoolingRates/cooling_rates.yml
+++ b/examples/Cooling/CoolingRates/cooling_rates.yml
@@ -30,6 +30,7 @@ EAGLEChemistry:
 EAGLECooling:
   dir_name:                ./coolingtables/
   H_reion_z:               11.5
+  H_reion_eV_p_H:          2.0
   He_reion_z_centre:       3.5
   He_reion_z_sigma:        0.5
   He_reion_eV_p_H:         2.0
diff --git a/examples/Cooling/CoolingRates/getCoolingTable.sh b/examples/Cooling/getEagleCoolingTable.sh
similarity index 100%
rename from examples/Cooling/CoolingRates/getCoolingTable.sh
rename to examples/Cooling/getEagleCoolingTable.sh
diff --git a/examples/Cooling/getCoolingTable.sh b/examples/Cooling/getGrackleCoolingTable.sh
similarity index 100%
rename from examples/Cooling/getCoolingTable.sh
rename to examples/Cooling/getGrackleCoolingTable.sh
diff --git a/examples/Cosmology/ConstantCosmoVolume/run.sh b/examples/Cosmology/ConstantCosmoVolume/run.sh
index 4a30410e868aef58b1a9dac0a3225e5844c5873f..9c0e0ccdcbbdd52b14230d98393637e99d9ad80f 100755
--- a/examples/Cosmology/ConstantCosmoVolume/run.sh
+++ b/examples/Cosmology/ConstantCosmoVolume/run.sh
@@ -9,11 +9,11 @@ fi
 if [ ! -e constantBox.hdf5 ]
 then
     echo "Generating initial conditions for the uniform cosmo box example..."
-    python makeIC.py
+    python3 makeIC.py
 fi
 
 # Run SWIFT
 ../../swift --hydro --cosmology --self-gravity --threads=8 constant_volume.yml 2>&1 | tee output.log
 
 # Plot the result
-python plotSolution.py $i
+python3 plotSolution.py $i
diff --git a/examples/EAGLE_ICs/EAGLE_12/eagle_12.yml b/examples/EAGLE_ICs/EAGLE_12/eagle_12.yml
index 4c3d7f0a3516ea7919a7ecd28efa6808c2f0f046..df4c05811bae17a65b54e45c6625ff97a21357f6 100644
--- a/examples/EAGLE_ICs/EAGLE_12/eagle_12.yml
+++ b/examples/EAGLE_ICs/EAGLE_12/eagle_12.yml
@@ -80,6 +80,7 @@ EAGLEChemistry:
 EAGLECooling:
   dir_name:                ./coolingtables/
   H_reion_z:               11.5 
+  H_reion_eV_p_H:          2.0
   He_reion_z_centre:       3.5
   He_reion_z_sigma:        0.5
   He_reion_eV_p_H:         2.0
diff --git a/examples/EAGLE_low_z/EAGLE_12/eagle_12.yml b/examples/EAGLE_low_z/EAGLE_12/eagle_12.yml
index d09bbb51e90d843dd6731c5fcbd48b9c586713f9..ada36234d6a9691a8d78a33a047088920e2c6a11 100644
--- a/examples/EAGLE_low_z/EAGLE_12/eagle_12.yml
+++ b/examples/EAGLE_low_z/EAGLE_12/eagle_12.yml
@@ -73,6 +73,7 @@ EAGLEChemistry: 	     # Solar abundances
 EAGLECooling:
   dir_name:                ./coolingtables/
   H_reion_z:               11.5 
+  H_reion_eV_p_H:          2.0
   He_reion_z_centre:       3.5
   He_reion_z_sigma:        0.5
   He_reion_eV_p_H:         2.0
diff --git a/examples/EAGLE_low_z/EAGLE_25/eagle_25.yml b/examples/EAGLE_low_z/EAGLE_25/eagle_25.yml
index 75799647b4e95ebd75202748c67a2c18c423f532..b1d897ec390ca0488229c460a4308c1ee793dbf7 100644
--- a/examples/EAGLE_low_z/EAGLE_25/eagle_25.yml
+++ b/examples/EAGLE_low_z/EAGLE_25/eagle_25.yml
@@ -80,6 +80,7 @@ EAGLEChemistry: 	     # Solar abundances
 EAGLECooling:
   dir_name:                ./coolingtables/
   H_reion_z:               11.5 
+  H_reion_eV_p_H:          2.0
   He_reion_z_centre:       3.5
   He_reion_z_sigma:        0.5
   He_reion_eV_p_H:         2.0
diff --git a/examples/EAGLE_low_z/EAGLE_50/eagle_50.yml b/examples/EAGLE_low_z/EAGLE_50/eagle_50.yml
index 6c0c7421ba4f804437a8086b42fb2878bd3904b1..c837c88d870f21907b9fe7fc1408c5df8db5dd0c 100644
--- a/examples/EAGLE_low_z/EAGLE_50/eagle_50.yml
+++ b/examples/EAGLE_low_z/EAGLE_50/eagle_50.yml
@@ -75,6 +75,7 @@ EAGLEChemistry: 	     # Solar abundances
 EAGLECooling:
   dir_name:                ./coolingtables/
   H_reion_z:               11.5 
+  H_reion_eV_p_H:          2.0
   He_reion_z_centre:       3.5
   He_reion_z_sigma:        0.5
   He_reion_eV_p_H:         2.0
diff --git a/examples/EAGLE_low_z/EAGLE_6/eagle_6.yml b/examples/EAGLE_low_z/EAGLE_6/eagle_6.yml
index 313a5a384324eecd56455ea22bbc96d147982d6b..4f68413fa4c69b8e2b9ff28e66f4f269d21a1a7b 100644
--- a/examples/EAGLE_low_z/EAGLE_6/eagle_6.yml
+++ b/examples/EAGLE_low_z/EAGLE_6/eagle_6.yml
@@ -84,9 +84,11 @@ EAGLEChemistry: 	     # Solar abundances
 EAGLECooling:
   dir_name:                ./coolingtables/
   H_reion_z:               11.5 
+  H_reion_eV_p_H:          2.0
   He_reion_z_centre:       3.5
   He_reion_z_sigma:        0.5
   He_reion_eV_p_H:         2.0
+
 # EAGLE star formation parameters
 EAGLEStarFormation:
   EOS_density_norm_H_p_cm3:          0.1       # Physical density used for the normalisation of the EOS assumed for the star-forming gas in Hydrogen atoms per cm^3.
diff --git a/examples/HydroTests/Diffusion_1D/.gitignore b/examples/HydroTests/Diffusion_1D/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..dadfbc6e8ce185fc82169300e6f289ed8abc9bf2
--- /dev/null
+++ b/examples/HydroTests/Diffusion_1D/.gitignore
@@ -0,0 +1 @@
+beta_*
diff --git a/examples/HydroTests/Diffusion_1D/README b/examples/HydroTests/Diffusion_1D/README
new file mode 100644
index 0000000000000000000000000000000000000000..6254e0ce9a7aa1af5f54ba388b2b08af6bb78739
--- /dev/null
+++ b/examples/HydroTests/Diffusion_1D/README
@@ -0,0 +1,19 @@
+Diffusion 1D
+============
+
+This is a very simple, 1D test. It sets up a uniform density particle
+distribution, with energy discontinuities generated at every particle.
+Particles have their internal energy set in a binary manner, with them
+alternating between "low" and "high" states. Under a standard SPH
+scheme, we expect to see no evolution whatsoever in the box. However,
+under a scheme with thermal diffusion, we expect that there will be
+some diffusion between the particles and that the distribution of
+internal energy will equalise.
+
+Included are some scripts to create initial conditions (`makeIC.py`),
+plot a solution (`plotSolution.py`), and to run the code (`run.sh`).
+Also included is a script to run a convergence test by changing the
+`SPH:beta_diffusion` parameter (`run_set.sh`).
+
+To make the initial conditions and produce the plots, the `swiftsimio`
+library (http://gitlab.cosma.dur.ac.uk/jborrow/swiftsimio) is required.
\ No newline at end of file
diff --git a/examples/HydroTests/Diffusion_1D/diffusion.yml b/examples/HydroTests/Diffusion_1D/diffusion.yml
new file mode 100644
index 0000000000000000000000000000000000000000..099cad637bf947926baa3571a2b1361d16293547
--- /dev/null
+++ b/examples/HydroTests/Diffusion_1D/diffusion.yml
@@ -0,0 +1,38 @@
+# Define the system of units to use internally. 
+InternalUnitSystem:
+  UnitMass_in_cgs:     1   # Grams
+  UnitLength_in_cgs:   1   # Centimeters
+  UnitVelocity_in_cgs: 1   # Centimeters per second
+  UnitCurrent_in_cgs:  1   # Amperes
+  UnitTemp_in_cgs:     1   # Kelvin
+
+# Parameters governing the time integration
+TimeIntegration:
+  time_begin: 0.    # The starting time of the simulation (in internal units).
+  time_end:   1e-0  # The end time of the simulation (in internal units).
+  dt_min:     1e-7  # The minimal time-step size of the simulation (in internal units).
+  dt_max:     1e-2  # The maximal time-step size of the simulation (in internal units).
+
+# Parameters governing the snapshots
+Snapshots:
+  basename:            diffusion # Common part of the name of output files
+  time_first:          0.    # Time of the first output (in internal units)
+  delta_time:          2e-2  # Time difference between consecutive outputs (in internal units)
+
+# Parameters governing the conserved quantities statistics
+Statistics:
+  delta_time:          1e-1 # Time between statistics output
+
+# Parameters for the hydrodynamics scheme
+SPH:
+  resolution_eta:        1.2348   # Target smoothing length in units of the mean inter-particle separation (1.2348 == 48Ngbs with the cubic spline kernel).
+  CFL_condition:         0.1      # Courant-Friedrich-Levy condition for time integration.
+  diffusion_alpha:       0.0     # (Optional) Override the initial value for the thermal diffusion coefficient in schemes with thermal diffusion.
+  diffusion_beta:        0.01     # (Optional) Override the decay/rise rate tuning parameter for the thermal diffusion.
+  diffusion_alpha_max:   1.0      # (Optional) Override the maximal thermal diffusion coefficient that is allowed for a given particle.
+  diffusion_alpha_min:   0.0      # (Optional) Override the minimal thermal diffusion coefficient that is allowed for a given particle.
+
+# Parameters related to the initial conditions
+InitialConditions:
+  file_name:  ./diffusion.hdf5          # The file to read
+  periodic:   1
diff --git a/examples/HydroTests/Diffusion_1D/diffusion_fixed_alpha.yml b/examples/HydroTests/Diffusion_1D/diffusion_fixed_alpha.yml
new file mode 100644
index 0000000000000000000000000000000000000000..36f70e2492a05e90ab29496d4fc064cc2c35f62f
--- /dev/null
+++ b/examples/HydroTests/Diffusion_1D/diffusion_fixed_alpha.yml
@@ -0,0 +1,38 @@
+# Define the system of units to use internally. 
+InternalUnitSystem:
+  UnitMass_in_cgs:     1   # Grams
+  UnitLength_in_cgs:   1   # Centimeters
+  UnitVelocity_in_cgs: 1   # Centimeters per second
+  UnitCurrent_in_cgs:  1   # Amperes
+  UnitTemp_in_cgs:     1   # Kelvin
+
+# Parameters governing the time integration
+TimeIntegration:
+  time_begin: 0.    # The starting time of the simulation (in internal units).
+  time_end:   1e-0  # The end time of the simulation (in internal units).
+  dt_min:     1e-7  # The minimal time-step size of the simulation (in internal units).
+  dt_max:     1e-2  # The maximal time-step size of the simulation (in internal units).
+
+# Parameters governing the snapshots
+Snapshots:
+  basename:            diffusion_fixed_alpha # Common part of the name of output files
+  time_first:          0.    # Time of the first output (in internal units)
+  delta_time:          2e-2  # Time difference between consecutive outputs (in internal units)
+
+# Parameters governing the conserved quantities statistics
+Statistics:
+  delta_time:          1e-1 # Time between statistics output
+
+# Parameters for the hydrodynamics scheme
+SPH:
+  resolution_eta:        1.2348   # Target smoothing length in units of the mean inter-particle separation (1.2348 == 48Ngbs with the cubic spline kernel).
+  CFL_condition:         0.1      # Courant-Friedrich-Levy condition for time integration.
+  diffusion_alpha:       0.1     # (Optional) Override the initial value for the thermal diffusion coefficient in schemes with thermal diffusion.
+  diffusion_beta:        0.01     # (Optional) Override the decay/rise rate tuning parameter for the thermal diffusion.
+  diffusion_alpha_max:   0.1      # (Optional) Override the maximal thermal diffusion coefficient that is allowed for a given particle.
+  diffusion_alpha_min:   0.1      # (Optional) Override the minimal thermal diffusion coefficient that is allowed for a given particle.
+
+# Parameters related to the initial conditions
+InitialConditions:
+  file_name:  ./diffusion.hdf5          # The file to read
+  periodic:   1
diff --git a/examples/HydroTests/Diffusion_1D/makeIC.py b/examples/HydroTests/Diffusion_1D/makeIC.py
new file mode 100644
index 0000000000000000000000000000000000000000..09a4b5c698c7351a8a08f53a268c2b333bfef991
--- /dev/null
+++ b/examples/HydroTests/Diffusion_1D/makeIC.py
@@ -0,0 +1,143 @@
+"""
+This file is part of SWIFT.
+Copyright (c) 2019 Josh Borrow (joshua.borrow@durham.ac.uk)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published
+by the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Creates initial conditiosn for the ContactDiscontinuty_1D test.
+Requires the swiftsimio library.
+"""
+
+import numpy as np
+import unyt
+
+
+def get_particle_positions(box_length: float, n_part: int) -> np.array:
+    """
+    Gets the particle positions evenly spaced along a _periodic_ box.
+    """
+
+    dx = box_length / float(n_part)
+    x = np.arange(n_part, dtype=float) * dx + (0.5 * dx)
+
+    return x
+
+
+def get_particle_u(low: float, high: float, n_part: int) -> np.array:
+    """
+    Gets the particle internal energies, which alternate between low
+    and high. Make sure n_part is even.
+    """
+
+    indicies = np.arange(n_part)
+    u = unyt.unyt_array(np.empty(n_part, dtype=float), low.units)
+    u[...] = low
+    u[(indicies % 2).astype(bool)] = high
+
+    return u
+
+
+def get_particle_masses(mass: float, n_part: int) -> np.array:
+    """
+    Gets the particle masses.
+    """
+
+    m = unyt.unyt_array(np.empty(n_part, dtype=float), mass.units)
+    m[...] = mass
+
+    return m
+
+
+def get_particle_hsml(box_length: float, n_part: int) -> np.array:
+    """
+    Gets the particle smoothing lengths based on their MIPS.
+    """
+
+    mips = box_length / float(n_part)
+    hsml = unyt.unyt_array(np.empty(n_part, dtype=float), box_length.units)
+    hsml[...] = mips
+
+    return hsml
+
+
+if __name__ == "__main__":
+    import argparse as ap
+    from swiftsimio import Writer
+
+    parser = ap.ArgumentParser(
+        description="Makes initial conditions for the ContactDiscontinuity_1D test."
+    )
+
+    parser.add_argument(
+        "-n",
+        "--npart",
+        help="Number of particles in the box. Make sure this is even. Default: 900",
+        type=int,
+        default=900,
+    )
+
+    parser.add_argument(
+        "-m",
+        "--mass",
+        help="Particle mass in grams. Default: 1e-4",
+        type=float,
+        default=1e-4,
+    )
+
+    parser.add_argument(
+        "-l",
+        "--low",
+        help="Low value for the internal energy (in ergs/g). Default: 1e-6",
+        type=float,
+        default=1e-6,
+    )
+
+    parser.add_argument(
+        "-t",
+        "--high",
+        help="Top/high value for the internal energy (in ergs/g). Default: 1e-4",
+        type=float,
+        default=1e-4,
+    )
+
+    parser.add_argument(
+        "-b", "--boxsize", help="Boxsize in cm. Default: 1.0", type=float, default=1.0
+    )
+
+    args = vars(parser.parse_args())
+    boxsize = args["boxsize"] * unyt.cm
+    n_part = args["npart"]
+    mass = args["mass"] * unyt.g
+    low = args["low"] * unyt.erg / unyt.g
+    high = args["high"] * unyt.erg / unyt.g
+
+    if not (n_part % 2 == 0):
+        raise AttributeError("Please ensure --npart is even.")
+
+    cgs = unyt.unit_systems.cgs_unit_system
+
+    boxsize = 1.0 * unyt.cm
+
+    writer = Writer(cgs, boxsize, dimension=1)
+
+    coordinates = np.zeros((n_part, 3), dtype=float) * unyt.cm
+    coordinates[:, 0] = get_particle_positions(boxsize, n_part)
+
+    writer.gas.coordinates = coordinates
+    writer.gas.velocities = np.zeros((n_part, 3), dtype=float) * unyt.cm / unyt.s
+    writer.gas.masses = get_particle_masses(mass, n_part)
+    writer.gas.internal_energy = get_particle_u(low, high, n_part)
+    writer.gas.smoothing_length = get_particle_hsml(boxsize, n_part)
+
+    writer.write("diffusion.hdf5")
diff --git a/examples/HydroTests/Diffusion_1D/plotSolution.py b/examples/HydroTests/Diffusion_1D/plotSolution.py
new file mode 100644
index 0000000000000000000000000000000000000000..66c8ffc6418f06589a2918ae4d8ed460b0081972
--- /dev/null
+++ b/examples/HydroTests/Diffusion_1D/plotSolution.py
@@ -0,0 +1,341 @@
+"""
+This file is part of SWIFT.
+Copyright (c) 2019 Josh Borrow (joshua.borrow@durham.ac.uk)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published
+by the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Plots the solution for the ContactDiscontinuity_1D test.
+"""
+
+import matplotlib
+import matplotlib.pyplot as plt
+import numpy as np
+
+try:
+    from scipy.integrate import solve_ivp
+    solve_ode = True
+except:
+    solve_ode = False
+
+from swiftsimio import load
+
+matplotlib.use("Agg")
+
+def solve_analytic(u_0, u_1, t_0, t_1, alpha=0.1):
+    """
+    Solves the analytic equation:
+
+    $$
+        \frac{d \Delta}{d t} = \kappa \alpha (
+            \sqrt{u_0 + \Delta} + \sqrt{u_1 + \Delta}
+        ) (
+            u_1 - u_0 - 2 \Delta
+        )
+    $$
+
+    from time t0 to t1.
+
+    + alpha is the gradient term 
+    + u_0 is the "low" state
+    + u_1 is the "high" state.
+    """
+
+    if not solve_ode:
+        return [0.0], [0.0]
+
+    def gradient(t, u):
+        """
+        Returns du0/dt, du1/dt
+        """
+
+        common = alpha * (np.sqrt(u[0]) + np.sqrt(u[1])) * (u[0] - u[1])
+
+        return np.array([-1.0 * common, 1.0 * common])
+
+    ret = solve_ivp(gradient, t_span=[t_0.value, t_1.value], y0=[u_0.value, u_1.value], t_eval=np.linspace(t_0.value, t_1.value, 100))
+
+    t = ret.t
+    high = ret.y[1]
+    low = ret.y[0]
+
+    return t, (high - low) * u_0.units
+
+
+def get_data_dump(metadata):
+    """
+    Gets a big data dump from the SWIFT metadata
+    """
+
+    try:
+        viscosity = metadata.viscosity_info
+    except:
+        viscosity = "No info"
+    
+    try:
+        diffusion = metadata.diffusion_info
+    except:
+        diffusion = "No info"
+
+    output = (
+        "SWIFT\n"
+        + metadata.code_info
+        + "\n\n"
+        + "Compiler\n"
+        + metadata.compiler_info
+        + "\n\n"
+        + "Hydrodynamics\n"
+        + metadata.hydro_info
+        + "\n\n"
+        + "Viscosity\n"
+        + viscosity
+        + "\n\n"
+        + "Diffusion\n"
+        + diffusion
+    )
+
+    return output
+
+
+def get_data_list(start: int, stop: int, handle: str):
+    """
+    Gets a list of swiftsimio objects that contains all of the data.
+    """
+
+    data = [load("{}_{:04d}.hdf5".format(handle, x)) for x in range(start, stop + 1)]
+
+    return data
+
+
+def setup_axes(size=[8, 8], dpi=300):
+    """
+    Sets up the axes with the correct labels, etc.
+    """
+    fig, ax = plt.subplots(ncols=2, nrows=2, figsize=size, dpi=dpi)
+
+    ax = ax.flatten()
+
+    ax[0].axis("off")
+    ax[1].set_xlabel("Time [s]")
+    ax[1].set_ylabel("Relative energy difference $u/\\left<u\\right>$")
+
+    ax[2].set_xlabel("Time [s]")
+    ax[2].set_ylabel("Deviation in position relative to MIPS [$\\times 10^{6}$]")
+
+    ax[3].set_xlabel("Time [s]")
+
+    return fig, ax
+
+def mean_std_max_min(data):
+    """
+    Returns:
+    mean, stdev, max, min
+    for your data.
+    """
+    means = np.array([np.mean(x) for x in data])
+    stdevs = np.array([np.std(x) for x in data])
+    maxs = np.array([np.max(x) for x in data])
+    mins = np.array([np.min(x) for x in data])
+
+    return means, stdevs, maxs, mins
+
+
+def extract_plottables_u(data_list):
+    """
+    Extracts the plottables for the internal energies. Returns:
+    mean, stdev, max, min differences between adjacent internal energies
+    """
+
+    data = [
+        np.diff(x.gas.internal_energy.value) / np.mean(x.gas.internal_energy.value)
+        for x in data_list
+    ]
+
+    return mean_std_max_min(data)
+
+
+def extract_plottables_x(data_list):
+    """
+    Extracts the plottables for positions. Returns:
+    mean, stdev, max, min * 1e6 deviations from original position
+    """
+
+    n_part = data_list[0].metadata.n_gas
+    boxsize = data_list[0].metadata.boxsize[0].value
+    dx = boxsize / n_part
+
+    original_x = np.arange(n_part, dtype=float) * dx + (0.5 * dx)
+    
+    deviations = [1e6 * abs(original_x - x.gas.coordinates.value[:, 0]) / dx for x in data_list]
+
+    return mean_std_max_min(deviations)
+
+
+def extract_plottables_rho(data_list):
+    """
+    Extracts the plottables for pressure. Returns:
+    mean, stdev, max, min * 1e6 deviations from mean density 
+    """
+
+    P = [x.gas.density.value for x in data_list]
+    mean_P = [np.mean(x) for x in P]
+    deviations = [1e6 * (x - y) / x for x, y in zip(mean_P, P)]
+
+    return mean_std_max_min(deviations)
+
+
+def extract_plottables_diff(data_list):
+    """
+    Extracts the plottables for pressure. Returns:
+    mean, stdev, max, min * 1e6 deviations from mean density 
+    """
+
+    P = [x.gas.diffusion.value for x in data_list]
+
+    return mean_std_max_min(P)
+
+
+def make_plot(start: int, stop: int, handle: str):
+    """
+    Makes the plot and returns the figure and axes objects.
+    """
+    fig, ax = setup_axes()
+    data_list = get_data_list(start, stop, handle)
+    data_dump = get_data_dump(data_list[0].metadata)
+    t = [x.metadata.t for x in data_list]
+    means, stdevs, maxs, mins = extract_plottables_u(data_list)
+    x_means, x_stdevs, x_maxs, x_mins = extract_plottables_x(data_list)
+
+    try:
+        alpha = np.mean([np.mean(x.gas.diffusion) for x in data_list])
+    except AttributeError:
+        # Must be using a non-diffusive scheme.
+        alpha = 0.0
+
+    ax[0].text(
+        0.5,
+        0.5,
+        data_dump,
+        ha="center",
+        va="center",
+        fontsize=8,
+        transform=ax[0].transAxes,
+    )
+
+    ax[1].fill_between(
+        t, means - stdevs, means + stdevs, color="C0", alpha=0.5, edgecolor="none"
+    )
+    ax[1].plot(t, means, label="Mean", c="C0")
+    ax[1].plot(t, maxs, label="Max", linestyle="dashed", c="C1")
+    ax[1].plot(t, mins, label="Min", linestyle="dashed", c="C2")
+
+    if solve_ode:
+        times_ode, diff = solve_analytic(
+            u_0=data_list[0].gas.internal_energy.min(),
+            u_1=data_list[0].gas.internal_energy.max(),
+            t_0=t[0],
+            t_1=t[-1],
+            alpha=(
+                np.sqrt(5.0/3.0 * (5.0/3.0 - 1.0)) * 
+                alpha / data_list[0].gas.smoothing_length[0].value
+            )
+        )
+
+        ax[1].plot(
+            times_ode,
+            (diff) / np.mean(data_list[0].gas.internal_energy),
+            label="Analytic",
+            linestyle="dotted",
+            c="C3"
+        )
+
+        #import pdb;pdb.set_trace()
+
+    ax[2].fill_between(
+        t, x_means - x_stdevs, x_means + x_stdevs, color="C0", alpha=0.5, edgecolor="none"
+    )
+    ax[2].plot(t, x_means, label="Mean", c="C0")
+    ax[2].plot(t, x_maxs, label="Max", linestyle="dashed", c="C1")
+    ax[2].plot(t, x_mins, label="Min", linestyle="dashed", c="C2")
+
+    try:
+        # Give diffusion info a go; this may not be present
+        diff_means, diff_stdevs, diff_maxs, diff_mins = extract_plottables_diff(data_list)
+
+        ax[3].set_ylabel(r"Diffusion parameter $\alpha_{diff}$")
+        ax[3].fill_between(
+            t, diff_means - diff_stdevs, diff_means + diff_stdevs, color="C0", alpha=0.5, edgecolor="none"
+        )
+        ax[3].plot(t, diff_means, label="Mean", c="C0")
+        ax[3].plot(t, diff_maxs, label="Max", linestyle="dashed", c="C1")
+        ax[3].plot(t, diff_mins, label="Min", linestyle="dashed", c="C2")
+
+    except:
+        # Diffusion info must not be present.
+        rho_means, rho_stdevs, rho_maxs, rho_mins = extract_plottables_rho(data_list)
+
+        ax[3].set_ylabel("Deviation from mean density $(\\rho_i - \\bar{\\rho}) / \\bar{\\rho}$ [$\\times 10^{6}$]")
+        ax[3].fill_between(
+            t, rho_means - rho_stdevs, rho_means + rho_stdevs, color="C0", alpha=0.5, edgecolor="none"
+        )
+        ax[3].plot(t, rho_means, label="Mean", c="C0")
+        ax[3].plot(t, rho_maxs, label="Max", linestyle="dashed", c="C1")
+        ax[3].plot(t, rho_mins, label="Min", linestyle="dashed", c="C2")
+
+    ax[1].legend(loc=1, markerfirst=False)
+
+    ax[1].set_xlim(t[0], t[-1])
+    ax[2].set_xlim(t[0], t[-1])
+    ax[3].set_xlim(t[0], t[-1])
+
+    fig.tight_layout()
+
+    return fig, ax
+
+
+if __name__ == "__main__":
+    import argparse as ap
+
+    parser = ap.ArgumentParser(
+        description="Makes a plot of the data from the ContactDiscontinuity_1D test."
+    )
+
+    parser.add_argument(
+        "-i", "--initial", help="Initial snapshot. Default: 0", type=int, default=0
+    )
+
+    parser.add_argument(
+        "-f", "--final", help="Final snapshot. Default: 50", type=int, default=50
+    )
+
+    parser.add_argument(
+        "-s",
+        "--snapshot",
+        help="First part of the snapshot filename. Default: diffusion",
+        type=str,
+        default="diffusion",
+    )
+
+    parser.add_argument(
+        "-o",
+        "--output",
+        help="Output filename. Default: diffusion.png",
+        type=str,
+        default="diffusion.png",
+    )
+
+    args = vars(parser.parse_args())
+
+    fig, ax = make_plot(args["initial"], args["final"], args["snapshot"])
+
+    fig.savefig(args["output"])
diff --git a/examples/HydroTests/Diffusion_1D/run.sh b/examples/HydroTests/Diffusion_1D/run.sh
new file mode 100755
index 0000000000000000000000000000000000000000..fb70805ca01b96df20fff438b2141b03ccf6e7ab
--- /dev/null
+++ b/examples/HydroTests/Diffusion_1D/run.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+ # Generate the initial conditions if they are not present.
+if [ ! -e diffusion.hdf5 ]
+then
+    echo "Generating initial conditions for the Sedov blast example..."
+    python makeIC.py
+fi
+
+# Run SWIFT
+../../swift --hydro --limiter --threads=1 diffusion.yml 2>&1 | tee output.log
diff --git a/examples/HydroTests/Diffusion_1D/run_set.sh b/examples/HydroTests/Diffusion_1D/run_set.sh
new file mode 100644
index 0000000000000000000000000000000000000000..d6b1f233e65b4e7851f15cf3bc8aadceff4710d7
--- /dev/null
+++ b/examples/HydroTests/Diffusion_1D/run_set.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+beta=(1.0 0.1 0.01 0.001)
+swift_location="../../swift"
+flags="--hydro --limiter --threads=2"
+parameter="diffusion.yml"
+parameter_fixed="diffusion_fixed_alpha.yml"
+make_ic_script="makeIC.py"
+plot_script="plotSolution.py"
+
+for i in ${beta[@]};
+do
+    mkdir beta_$i
+    cd beta_$i
+
+    python ../$make_ic_script
+
+    ../$swift_location $flags -P "SPH:diffusion_beta:${i}" ../$parameter
+    python ../$plot_script
+    ../$swift_location $flags -P "SPH:diffusion_beta:${i}" ../$parameter_fixed
+    python ../$plot_script -s diffusion_fixed_alpha -o diffusion_fixed_alpha.png
+
+    rm *.hdf5
+
+    cd ..
+done
diff --git a/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/isolated_galaxy.yml b/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/isolated_galaxy.yml
index 7ba1e601c764d9c12b93178efd8226601af8373c..7dac0a8a6c3b8d4c583ae6138513f0c5259227b1 100644
--- a/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/isolated_galaxy.yml
+++ b/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/isolated_galaxy.yml
@@ -50,6 +50,7 @@ SPH:
 EAGLECooling:
   dir_name:                ./coolingtables/  # Location of the Wiersma+08 cooling tables
   H_reion_z:               11.5              # Redshift of Hydrogen re-ionization
+  H_reion_eV_p_H:          2.0
   He_reion_z_centre:       3.5               # Redshift of the centre of the Helium re-ionization Gaussian
   He_reion_z_sigma:        0.5               # Spread in redshift of the  Helium re-ionization Gaussian
   He_reion_eV_p_H:         2.0               # Energy inject by Helium re-ionization in electron-volt per Hydrogen atom
diff --git a/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/run.sh b/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/run.sh
index f2aa93fd0e11cd9b07be991187cf0780a82ebec8..dc0b49478cdabefbe4dbf3544e097f18593cfb16 100755
--- a/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/run.sh
+++ b/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/run.sh
@@ -6,7 +6,7 @@ then
     ./getIC.sh
 fi
 
-../../swift --threads=32 --external-gravity --self-gravity --stars --star-formation --cooling --temperature --hydro isolated_galaxy.yml 2>&1 | tee output.log
+../../swift --threads=16 --external-gravity --self-gravity --stars --star-formation --cooling --hydro isolated_galaxy.yml -v 1 2>&1 | tee output.log
 
 # Kennicutt-Schmidt law plot
 python3 plotSolution.py
diff --git a/examples/SantaBarbara/SantaBarbara-256/santa_barbara.yml b/examples/SantaBarbara/SantaBarbara-256/santa_barbara.yml
index 0abbc91019957952276b51db01a3a1b71d6e4fdf..9f6585e0c589d3d016921eb85dd6af13a0643784 100644
--- a/examples/SantaBarbara/SantaBarbara-256/santa_barbara.yml
+++ b/examples/SantaBarbara/SantaBarbara-256/santa_barbara.yml
@@ -76,6 +76,7 @@ EAGLEChemistry:
 EAGLECooling:
   dir_name:                ./coolingtables/
   H_reion_z:               11.5 
+  H_reion_eV_p_H:          2.0
   He_reion_z_centre:       3.5
   He_reion_z_sigma:        0.5
   He_reion_eV_p_H:         2.0
diff --git a/examples/SmallCosmoVolume/SmallCosmoVolume_cooling/small_cosmo_volume.yml b/examples/SmallCosmoVolume/SmallCosmoVolume_cooling/small_cosmo_volume.yml
index 96f10465410ac120b30904a8655da4d8133d09bd..b108290fcd146461827d5858742bd0971ac66945 100644
--- a/examples/SmallCosmoVolume/SmallCosmoVolume_cooling/small_cosmo_volume.yml
+++ b/examples/SmallCosmoVolume/SmallCosmoVolume_cooling/small_cosmo_volume.yml
@@ -67,6 +67,7 @@ LambdaCooling:
 EAGLECooling:
   dir_name:                 ./coolingtables/
   H_reion_z:               11.5
+  H_reion_eV_p_H:          2.0
   He_reion_z_centre:       3.5
   He_reion_z_sigma:        0.5
   He_reion_eV_p_H:         2.0
diff --git a/src/cell.c b/src/cell.c
index 15ea5fc6981d671fff163b52efb3bc36e371aaba..a13a955a9bb61e0f3eaac39ff18555fc1ac5dc4f 100644
--- a/src/cell.c
+++ b/src/cell.c
@@ -3226,9 +3226,12 @@ int cell_unskip_hydro_tasks(struct cell *c, struct scheduler *s) {
     if (c->timestep != NULL) scheduler_activate(s, c->timestep);
     if (c->hydro.end_force != NULL) scheduler_activate(s, c->hydro.end_force);
     if (c->hydro.cooling != NULL) scheduler_activate(s, c->hydro.cooling);
-    if (c->hydro.star_formation != NULL)
-      scheduler_activate(s, c->hydro.star_formation);
     if (c->logger != NULL) scheduler_activate(s, c->logger);
+
+    if (c->hydro.star_formation != NULL) {
+      scheduler_activate(s, c->hydro.star_formation);
+      cell_activate_drift_spart(c, s);
+    }
   }
 
   return rebuild;
diff --git a/src/cell.h b/src/cell.h
index baae12e4a5797e3b1e00eee144635e41b52c157e..92f6bf95692bd01ddd2b6fe681ae159d72840917 100644
--- a/src/cell.h
+++ b/src/cell.h
@@ -687,9 +687,12 @@ struct cell {
   /*! The maximal depth of this cell and its progenies */
   char maxdepth;
 
-#ifdef SWIFT_DEBUG_CHECKS
+#if defined(SWIFT_DEBUG_CHECKS) || defined(SWIFT_CELL_GRAPH)
   /* Cell ID (for debugging) */
   int cellID;
+#endif
+
+#ifdef SWIFT_DEBUG_CHECKS
 
   /*! The list of tasks that have been executed on this cell */
   char tasks_executed[64];
diff --git a/src/common_io.c b/src/common_io.c
index 733cf1dacac5f0c73ea401a584e2aa40eadd4a23..2b8a55f0eba047a6076a3023569d05ddf49b376b 100644
--- a/src/common_io.c
+++ b/src/common_io.c
@@ -557,7 +557,7 @@ void io_write_cell_offsets(hid_t h_grp, const int cdim[3],
     H5Gclose(h_subgrp);
 
     /* Write the centres to the group */
-    hsize_t shape[2] = {nr_cells, 3};
+    hsize_t shape[2] = {(hsize_t)nr_cells, 3};
     hid_t h_space = H5Screate(H5S_SIMPLE);
     if (h_space < 0) error("Error while creating data space for cell centres");
     hid_t h_err = H5Sset_extent_simple(h_space, 2, shape, shape);
diff --git a/src/cooling.h b/src/cooling.h
index 875ef5054491f783d526e7c8e2caf3e005c8a5a0..9b9b255dc7f845adeed8177b4385e08aaffbd977 100644
--- a/src/cooling.h
+++ b/src/cooling.h
@@ -31,6 +31,7 @@
 #include "parser.h"
 #include "physical_constants.h"
 #include "restart.h"
+#include "space.h"
 #include "units.h"
 
 /* Import the right cooling definition */
diff --git a/src/cooling/Compton/cooling.h b/src/cooling/Compton/cooling.h
index c796375c33c586e2c9a95515f4124062a41640eb..9e5a5ad34a9086152b98a1f1709e3755d875fb83 100644
--- a/src/cooling/Compton/cooling.h
+++ b/src/cooling/Compton/cooling.h
@@ -49,9 +49,11 @@
  *
  * @param cosmo The current cosmological model.
  * @param cooling The #cooling_function_data used in the run.
+ * @param s The #space containing all the particles.
  */
 INLINE static void cooling_update(const struct cosmology* cosmo,
-                                  struct cooling_function_data* cooling) {
+                                  struct cooling_function_data* cooling,
+                                  struct space* s) {
   // Add content if required.
 }
 
diff --git a/src/cooling/EAGLE/cooling.c b/src/cooling/EAGLE/cooling.c
index 87c12e73d970b4d1caa6ce33c20666556463e08c..2e829c9f1852d96f40a91e6c95cc8d803a8095a6 100644
--- a/src/cooling/EAGLE/cooling.c
+++ b/src/cooling/EAGLE/cooling.c
@@ -45,6 +45,7 @@
 #include "parser.h"
 #include "part.h"
 #include "physical_constants.h"
+#include "space.h"
 #include "units.h"
 
 /* Maximum number of iterations for newton
@@ -57,8 +58,8 @@ static const float explicit_tolerance = 0.05;
 static const float newton_tolerance = 1.0e-4;
 static const float bisection_tolerance = 1.0e-6;
 static const float rounding_tolerance = 1.0e-4;
-static const double bracket_factor = 1.5;              /* sqrt(1.1) */
-static const double newton_log_u_guess_cgs = 12.30103; /* log10(2e12) */
+static const double bracket_factor = 1.5;
+static const double newton_log_u_guess_cgs = 12;
 
 /**
  * @brief Find the index of the current redshift along the redshift dimension
@@ -123,11 +124,14 @@ __attribute__((always_inline)) INLINE void get_redshift_index(
  * given time-step or redshift. Predominantly used to read cooling tables
  * above and below the current redshift, if not already read in.
  *
+ * Also calls the additional H reionisation energy injection if need be.
+ *
  * @param cosmo The current cosmological model.
  * @param cooling The #cooling_function_data used in the run.
+ * @param s The space data, including a pointer to array of particles
  */
 void cooling_update(const struct cosmology *cosmo,
-                    struct cooling_function_data *cooling) {
+                    struct cooling_function_data *cooling, struct space *s) {
 
   /* Current redshift */
   const float redshift = cosmo->z;
@@ -138,6 +142,23 @@ void cooling_update(const struct cosmology *cosmo,
   get_redshift_index(redshift, &z_index, &dz, cooling);
   cooling->dz = dz;
 
+  /* Extra energy for reionization? */
+  if (!cooling->H_reion_done) {
+
+    /* Does this timestep straddle Hydrogen reionization? If so, we need to
+     * input extra heat */
+    if (cosmo->z <= cooling->H_reion_z && cosmo->z_old > cooling->H_reion_z) {
+
+      if (s == NULL) error("Trying to do H reionization on an empty space!");
+
+      /* Inject energy to all particles */
+      cooling_Hydrogen_reionization(cooling, cosmo, s);
+
+      /* Flag that reionization happened */
+      cooling->H_reion_done = 1;
+    }
+  }
+
   /* Do we already have the correct tables loaded? */
   if (cooling->z_index == z_index) return;
 
@@ -209,7 +230,8 @@ INLINE static float newton_iter(
   const float log_table_bound_low = (cooling->Therm[0] + 0.05) / M_LOG10E;
 
   /* convert Hydrogen mass fraction in Hydrogen number density */
-  const float XH = p->chemistry_data.metal_mass_fraction[chemistry_element_H];
+  const float XH =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_H];
   const double n_H =
       hydro_get_physical_density(p, cosmo) * XH / phys_const->const_proton_mass;
   const double n_H_cgs = n_H * cooling->number_density_to_cgs;
@@ -501,8 +523,10 @@ void cooling_cool_part(const struct phys_const *phys_const,
   abundance_ratio_to_solar(p, cooling, abundance_ratio);
 
   /* Get the Hydrogen and Helium mass fractions */
-  const float XH = p->chemistry_data.metal_mass_fraction[chemistry_element_H];
-  const float XHe = p->chemistry_data.metal_mass_fraction[chemistry_element_He];
+  const float XH =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_H];
+  const float XHe =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_He];
 
   /* Get the Helium mass fraction. Note that this is He / (H + He), i.e. a
    * metal-free Helium mass fraction as per the Wiersma+08 definition */
@@ -531,15 +555,17 @@ void cooling_cool_part(const struct phys_const *phys_const,
      re-ionization as this needs to be added on no matter what */
 
   /* Get helium and hydrogen reheating term */
-  const double Helium_reion_heat_cgs = eagle_helium_reionization_extraheat(
-      cooling->z_index, delta_redshift, cooling);
+  const double Helium_reion_heat_cgs =
+      eagle_helium_reionization_extraheat(cosmo->z, delta_redshift, cooling);
 
   /* Convert this into a rate */
   const double Lambda_He_reion_cgs =
       Helium_reion_heat_cgs / (dt_cgs * ratefact_cgs);
 
   /* Let's compute the internal energy at the end of the step */
-  double u_final_cgs;
+  /* Initialise to the initial energy to appease compiler; this will never not
+     be overwritten. */
+  double u_final_cgs = u_0_cgs;
 
   /* First try an explicit integration (note we ignore the derivative) */
   const double LambdaNet_cgs =
@@ -719,8 +745,10 @@ float cooling_get_temperature(
   const double u_cgs = u * cooling->internal_energy_to_cgs;
 
   /* Get the Hydrogen and Helium mass fractions */
-  const float XH = p->chemistry_data.metal_mass_fraction[chemistry_element_H];
-  const float XHe = p->chemistry_data.metal_mass_fraction[chemistry_element_He];
+  const float XH =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_H];
+  const float XHe =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_He];
 
   /* Get the Helium mass fraction. Note that this is He / (H + He), i.e. a
    * metal-free Helium mass fraction as per the Wiersma+08 definition */
@@ -760,6 +788,41 @@ __attribute__((always_inline)) INLINE float cooling_get_radiated_energy(
   return xp->cooling_data.radiated_energy;
 }
 
+/**
+ * @brief Inject a fixed amount of energy to each particle in the simulation
+ * to mimic Hydrogen reionization.
+ *
+ * @param cooling The properties of the cooling model.
+ * @param cosmo The cosmological model.
+ * @param s The #space containing the particles.
+ */
+void cooling_Hydrogen_reionization(const struct cooling_function_data *cooling,
+                                   const struct cosmology *cosmo,
+                                   struct space *s) {
+
+  struct part *parts = s->parts;
+  struct xpart *xparts = s->xparts;
+
+  /* Energy to inject in internal units */
+  const float extra_heat =
+      cooling->H_reion_heat_cgs * cooling->internal_energy_from_cgs;
+
+  message("Applying extra energy for H reionization!");
+
+  /* Loop through particles and set new heat */
+  for (size_t i = 0; i < s->nr_parts; i++) {
+
+    struct part *p = &parts[i];
+    struct xpart *xp = &xparts[i];
+
+    const float old_u = hydro_get_physical_internal_energy(p, xp, cosmo);
+    const float new_u = old_u + extra_heat;
+
+    hydro_set_physical_internal_energy(p, xp, cosmo, new_u);
+    hydro_set_drifted_physical_internal_energy(p, cosmo, new_u);
+  }
+}
+
 /**
  * @brief Initialises properties stored in the cooling_function_data struct
  *
@@ -774,10 +837,19 @@ void cooling_init_backend(struct swift_params *parameter_file,
                           struct cooling_function_data *cooling) {
 
   /* read some parameters */
+
+  /* Despite the names, the values of H_reion_heat_cgs and He_reion_heat_cgs
+   * that are read in are actually in units of electron volts per proton mass.
+   * We later convert to units just below */
+
   parser_get_param_string(parameter_file, "EAGLECooling:dir_name",
                           cooling->cooling_table_path);
+
+  cooling->H_reion_done = 0;
   cooling->H_reion_z =
       parser_get_param_float(parameter_file, "EAGLECooling:H_reion_z");
+  cooling->H_reion_heat_cgs =
+      parser_get_param_float(parameter_file, "EAGLECooling:H_reion_eV_p_H");
   cooling->He_reion_z_centre =
       parser_get_param_float(parameter_file, "EAGLECooling:He_reion_z_centre");
   cooling->He_reion_z_sigma =
@@ -791,10 +863,19 @@ void cooling_init_backend(struct swift_params *parameter_file,
   cooling->S_over_Si_ratio_in_solar = parser_get_opt_param_float(
       parameter_file, "EAGLECooling:S_over_Si_in_solar", 1.f);
 
-  /* Convert to cgs (units used internally by the cooling routines) */
+  /* Convert H_reion_heat_cgs and He_reion_heat_cgs to cgs
+   * (units used internally by the cooling routines). This is done by
+   * multiplying by 'eV/m_H' in internal units, then converting to cgs units.
+   * Note that the dimensions of these quantities are energy/mass = velocity^2
+   */
+
+  cooling->H_reion_heat_cgs *=
+      phys_const->const_electron_volt / phys_const->const_proton_mass *
+      units_cgs_conversion_factor(us, UNIT_CONV_ENERGY_PER_UNIT_MASS);
+
   cooling->He_reion_heat_cgs *=
-      phys_const->const_electron_volt *
-      units_cgs_conversion_factor(us, UNIT_CONV_ENERGY);
+      phys_const->const_electron_volt / phys_const->const_proton_mass *
+      units_cgs_conversion_factor(us, UNIT_CONV_ENERGY_PER_UNIT_MASS);
 
   /* Read in the list of redshifts */
   get_cooling_redshifts(cooling);
@@ -884,7 +965,7 @@ void cooling_restore_tables(struct cooling_function_data *cooling,
   /* Force a re-read of the cooling tables */
   cooling->z_index = -10;
   cooling->previous_z_index = eagle_cooling_N_redshifts - 2;
-  cooling_update(cosmo, cooling);
+  cooling_update(cosmo, cooling, /*space=*/NULL);
 }
 
 /**
diff --git a/src/cooling/EAGLE/cooling.h b/src/cooling/EAGLE/cooling.h
index d95c75e58aecfd8fb4816f1e50c7a3f379a08e51..eac3425d25f5f4c8fd0a5ed7656423379a3ad3f9 100644
--- a/src/cooling/EAGLE/cooling.h
+++ b/src/cooling/EAGLE/cooling.h
@@ -32,9 +32,10 @@ struct xpart;
 struct cosmology;
 struct hydro_props;
 struct entropy_floor_properties;
+struct space;
 
 void cooling_update(const struct cosmology *cosmo,
-                    struct cooling_function_data *cooling);
+                    struct cooling_function_data *cooling, struct space *s);
 
 void cooling_cool_part(const struct phys_const *phys_const,
                        const struct unit_system *us,
@@ -70,14 +71,15 @@ float cooling_get_temperature(
 
 float cooling_get_radiated_energy(const struct xpart *restrict xp);
 
+void cooling_Hydrogen_reionization(const struct cooling_function_data *cooling,
+                                   const struct cosmology *cosmo,
+                                   struct space *s);
+
 void cooling_init_backend(struct swift_params *parameter_file,
                           const struct unit_system *us,
                           const struct phys_const *phys_const,
                           struct cooling_function_data *cooling);
 
-void cooling_restore_tables(struct cooling_function_data *cooling,
-                            const struct cosmology *cosmo);
-
 void cooling_print_backend(const struct cooling_function_data *cooling);
 
 void cooling_clean(struct cooling_function_data *data);
diff --git a/src/cooling/EAGLE/cooling_rates.h b/src/cooling/EAGLE/cooling_rates.h
index d315a5ba339956828505c5f48165abdd2b2e0486..35a53b43fb26466686fa87704ec174a849667a78 100644
--- a/src/cooling/EAGLE/cooling_rates.h
+++ b/src/cooling/EAGLE/cooling_rates.h
@@ -54,39 +54,49 @@ __attribute__((always_inline)) INLINE void abundance_ratio_to_solar(
     const struct part *p, const struct cooling_function_data *cooling,
     float ratio_solar[chemistry_element_count + 2]) {
 
-  ratio_solar[0] = p->chemistry_data.metal_mass_fraction[chemistry_element_H] *
-                   cooling->SolarAbundances_inv[0 /* H */];
+  ratio_solar[0] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_H] *
+      cooling->SolarAbundances_inv[0 /* H */];
 
-  ratio_solar[1] = p->chemistry_data.metal_mass_fraction[chemistry_element_He] *
-                   cooling->SolarAbundances_inv[1 /* He */];
+  ratio_solar[1] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_He] *
+      cooling->SolarAbundances_inv[1 /* He */];
 
-  ratio_solar[2] = p->chemistry_data.metal_mass_fraction[chemistry_element_C] *
-                   cooling->SolarAbundances_inv[2 /* C */];
+  ratio_solar[2] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_C] *
+      cooling->SolarAbundances_inv[2 /* C */];
 
-  ratio_solar[3] = p->chemistry_data.metal_mass_fraction[chemistry_element_N] *
-                   cooling->SolarAbundances_inv[3 /* N */];
+  ratio_solar[3] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_N] *
+      cooling->SolarAbundances_inv[3 /* N */];
 
-  ratio_solar[4] = p->chemistry_data.metal_mass_fraction[chemistry_element_O] *
-                   cooling->SolarAbundances_inv[4 /* O */];
+  ratio_solar[4] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_O] *
+      cooling->SolarAbundances_inv[4 /* O */];
 
-  ratio_solar[5] = p->chemistry_data.metal_mass_fraction[chemistry_element_Ne] *
-                   cooling->SolarAbundances_inv[5 /* Ne */];
+  ratio_solar[5] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_Ne] *
+      cooling->SolarAbundances_inv[5 /* Ne */];
 
-  ratio_solar[6] = p->chemistry_data.metal_mass_fraction[chemistry_element_Mg] *
-                   cooling->SolarAbundances_inv[6 /* Mg */];
+  ratio_solar[6] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_Mg] *
+      cooling->SolarAbundances_inv[6 /* Mg */];
 
-  ratio_solar[7] = p->chemistry_data.metal_mass_fraction[chemistry_element_Si] *
-                   cooling->SolarAbundances_inv[7 /* Si */];
+  ratio_solar[7] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_Si] *
+      cooling->SolarAbundances_inv[7 /* Si */];
 
   /* For S, we use the same ratio as Si */
-  ratio_solar[8] = p->chemistry_data.metal_mass_fraction[chemistry_element_Si] *
-                   cooling->SolarAbundances_inv[7 /* Si */] *
-                   cooling->S_over_Si_ratio_in_solar;
+  ratio_solar[8] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_Si] *
+      cooling->SolarAbundances_inv[7 /* Si */] *
+      cooling->S_over_Si_ratio_in_solar;
 
   /* For Ca, we use the same ratio as Si */
-  ratio_solar[9] = p->chemistry_data.metal_mass_fraction[chemistry_element_Si] *
-                   cooling->SolarAbundances_inv[7 /* Si */] *
-                   cooling->Ca_over_Si_ratio_in_solar;
+  ratio_solar[9] =
+      p->chemistry_data.smoothed_metal_mass_fraction[chemistry_element_Si] *
+      cooling->SolarAbundances_inv[7 /* Si */] *
+      cooling->Ca_over_Si_ratio_in_solar;
 
   ratio_solar[10] =
       p->chemistry_data.metal_mass_fraction[chemistry_element_Fe] *
diff --git a/src/cooling/EAGLE/cooling_struct.h b/src/cooling/EAGLE/cooling_struct.h
index 0922bf74461c222bd6485bdc07cc35edc462ddba..88e49036f62962d35025f7fa81d5703a1245e3ce 100644
--- a/src/cooling/EAGLE/cooling_struct.h
+++ b/src/cooling/EAGLE/cooling_struct.h
@@ -74,9 +74,15 @@ struct cooling_function_data {
   /*! Filepath to the directory containing the HDF5 cooling tables */
   char cooling_table_path[eagle_table_path_name_length];
 
-  /*! Redshit of H reionization */
+  /*! Redshift of H reionization */
   float H_reion_z;
 
+  /*! H reionization energy in CGS units */
+  float H_reion_heat_cgs;
+
+  /*! Have we already done H reioisation? */
+  int H_reion_done;
+
   /*! Ca over Si abundance divided by the solar ratio for these elements */
   float Ca_over_Si_ratio_in_solar;
 
diff --git a/src/cooling/const_du/cooling.h b/src/cooling/const_du/cooling.h
index 15eecc43093e9cc571d166aa49392e7dfea60c11..c57ef4a6874e0314bcea672cd514d1419b1acdd8 100644
--- a/src/cooling/const_du/cooling.h
+++ b/src/cooling/const_du/cooling.h
@@ -54,9 +54,11 @@
  *
  * @param cosmo The current cosmological model.
  * @param cooling The #cooling_function_data used in the run.
+ * @param s The #space containing all the particles.
  */
 INLINE static void cooling_update(const struct cosmology* cosmo,
-                                  struct cooling_function_data* cooling) {
+                                  struct cooling_function_data* cooling,
+                                  struct space* s) {
   // Add content if required.
 }
 
diff --git a/src/cooling/const_lambda/cooling.h b/src/cooling/const_lambda/cooling.h
index 974b055b1f8942f53b72e6ccf17389d8f85b666e..1e50c162d02e8c326f67978a7de73fda5c6aecd8 100644
--- a/src/cooling/const_lambda/cooling.h
+++ b/src/cooling/const_lambda/cooling.h
@@ -51,9 +51,11 @@
  *
  * @param cosmo The current cosmological model.
  * @param cooling The #cooling_function_data used in the run.
+ * @param s The #space containing all the particles.
  */
 INLINE static void cooling_update(const struct cosmology* cosmo,
-                                  struct cooling_function_data* cooling) {
+                                  struct cooling_function_data* cooling,
+                                  struct space* s) {
   // Add content if required.
 }
 
diff --git a/src/cooling/grackle/cooling.h b/src/cooling/grackle/cooling.h
index 2632de7e223306a6c6400e350f8cb62a62e58206..edf8f0ca50cc498b8d1b235196addb5a694a0b80 100644
--- a/src/cooling/grackle/cooling.h
+++ b/src/cooling/grackle/cooling.h
@@ -66,9 +66,11 @@ static gr_float cooling_new_energy(
  *
  * @param cosmo The current cosmological model.
  * @param cooling The #cooling_function_data used in the run.
+ * @param s The #space containing all the particles.
  */
 INLINE static void cooling_update(const struct cosmology* cosmo,
-                                  struct cooling_function_data* cooling) {
+                                  struct cooling_function_data* cooling,
+                                  struct space* s) {
   /* set current time */
   if (cooling->redshift == -1)
     cooling->units.a_value = cosmo->a;
diff --git a/src/cooling/none/cooling.h b/src/cooling/none/cooling.h
index 3f90d357ad863da0525859f06e85a4cc492d3ae2..20aef187d912db379bb1c51ad9e8a4f16e47778c 100644
--- a/src/cooling/none/cooling.h
+++ b/src/cooling/none/cooling.h
@@ -41,13 +41,13 @@
  * @brief Common operations performed on the cooling function at a
  * given time-step or redshift.
  *
- * @param phys_const The physical constants in internal units.
- * @param us The internal system of units.
  * @param cosmo The current cosmological model.
  * @param cooling The #cooling_function_data used in the run.
+ * @param s The #space containing all the particles.
  */
 INLINE static void cooling_update(const struct cosmology* cosmo,
-                                  struct cooling_function_data* cooling) {
+                                  struct cooling_function_data* cooling,
+                                  struct space* s) {
   // Add content if required.
 }
 
diff --git a/src/cosmology.c b/src/cosmology.c
index be23343d0d62584cd3a811e547b327120db744ef..a18f52b84da330238caaa0a16bb69de025e92046 100644
--- a/src/cosmology.c
+++ b/src/cosmology.c
@@ -140,6 +140,10 @@ double cosmology_get_time_since_big_bang(const struct cosmology *c, double a) {
 void cosmology_update(struct cosmology *c, const struct phys_const *phys_const,
                       integertime_t ti_current) {
 
+  /* Save the previous state */
+  c->z_old = c->z;
+  c->a_old = c->a;
+
   /* Get scale factor and powers of it */
   const double a = c->a_begin * exp(ti_current * c->time_base);
   const double a_inv = 1. / a;
@@ -527,6 +531,10 @@ void cosmology_init(struct swift_params *params, const struct unit_system *us,
   /* Update the times */
   c->time_begin = cosmology_get_time_since_big_bang(c, c->a_begin);
   c->time_end = cosmology_get_time_since_big_bang(c, c->a_end);
+
+  /* Initialise the old values to a valid state */
+  c->a_old = c->a_begin;
+  c->z_old = 1. / c->a_old - 1.;
 }
 
 /**
@@ -568,6 +576,9 @@ void cosmology_init_no_cosmo(struct cosmology *c) {
   c->a_factor_hydro_accel = 1.;
   c->a_factor_grav_accel = 1.;
 
+  c->a_old = 1.;
+  c->z_old = 0.;
+
   c->critical_density = 0.;
   c->critical_density_0 = 0.;
 
diff --git a/src/cosmology.h b/src/cosmology.h
index d6b7dfbdc854a66f89c5511a5076c4fb4a7a5d3f..f2abdb6c62e7509c593b5edfbdb9dd8fe0c99e72 100644
--- a/src/cosmology.h
+++ b/src/cosmology.h
@@ -93,6 +93,12 @@ struct cosmology {
   /*! Dark-energy equation of state at the current time */
   double w;
 
+  /*! Scale-factor at the previous time-step */
+  double a_old;
+
+  /*! Redshit at the previous time-step */
+  double z_old;
+
   /*------------------------------------------------------------------ */
 
   /*! Starting expansion factor */
diff --git a/src/engine.c b/src/engine.c
index 17b4c50dae2b54cb749238bc100f216b975ff16e..38614c3ca2fb69142e7e5bd2f769e37326fc13a2 100644
--- a/src/engine.c
+++ b/src/engine.c
@@ -2878,7 +2878,7 @@ void engine_init_particles(struct engine *e, int flag_entropy_ICs,
   /* Update the cooling function */
   if ((e->policy & engine_policy_cooling) ||
       (e->policy & engine_policy_temperature))
-    cooling_update(e->cosmology, e->cooling_func);
+    cooling_update(e->cosmology, e->cooling_func, e->s);
 
 #ifdef WITH_LOGGER
   /* Mark the first time step in the particle logger file. */
@@ -2948,6 +2948,7 @@ void engine_init_particles(struct engine *e, int flag_entropy_ICs,
 #endif
 
   scheduler_write_dependencies(&e->sched, e->verbose);
+  space_write_cell_hierarchy(e->s);
   if (e->nodeID == 0) scheduler_write_task_level(&e->sched);
 
   /* Run the 0th time-step */
@@ -3143,7 +3144,7 @@ void engine_step(struct engine *e) {
   /* Update the cooling function */
   if ((e->policy & engine_policy_cooling) ||
       (e->policy & engine_policy_temperature))
-    cooling_update(e->cosmology, e->cooling_func);
+    cooling_update(e->cosmology, e->cooling_func, e->s);
 
   /*****************************************************/
   /* OK, we now know what the next end of time-step is */
@@ -4040,7 +4041,7 @@ void engine_collect_stars_counter(struct engine *e) {
   }
 
   free(n_sparts);
-  free(n_sparts_in);
+  free(n_sparts_int);
   swift_free("sparts", sparts);
 #endif
 }
diff --git a/src/engine_marktasks.c b/src/engine_marktasks.c
index c02eb5d2bd272111808701269faed07cef505449..9b34b3ea95a9ae8bc848a90113647b3e68b121b1 100644
--- a/src/engine_marktasks.c
+++ b/src/engine_marktasks.c
@@ -642,13 +642,17 @@ void engine_marktasks_mapper(void *map_data, int num_elements,
         scheduler_activate(s, t);
     }
 
-    /* Subgrid tasks */
+    /* Subgrid tasks: cooling */
     else if (t_type == task_type_cooling) {
-      if (cell_is_active_hydro(t->ci, e) || cell_is_active_gravity(t->ci, e))
-        scheduler_activate(s, t);
-    } else if (t_type == task_type_star_formation) {
-      if (cell_is_active_hydro(t->ci, e) || cell_is_active_gravity(t->ci, e))
+      if (cell_is_active_hydro(t->ci, e)) scheduler_activate(s, t);
+    }
+
+    /* Subgrid tasks: star formation */
+    else if (t_type == task_type_star_formation) {
+      if (cell_is_active_hydro(t->ci, e)) {
         scheduler_activate(s, t);
+        cell_activate_drift_spart(t->ci, s);
+      }
     }
   }
 }
diff --git a/src/entropy_floor/EAGLE/entropy_floor.h b/src/entropy_floor/EAGLE/entropy_floor.h
index 41d35fa0484cc1ee491a3c6293893ad5d2b5583f..5a53b3b39c9df3aa624b3fd93e82bed9d221204c 100644
--- a/src/entropy_floor/EAGLE/entropy_floor.h
+++ b/src/entropy_floor/EAGLE/entropy_floor.h
@@ -98,48 +98,117 @@ static INLINE float entropy_floor(
     const struct part *p, const struct cosmology *cosmo,
     const struct entropy_floor_properties *props) {
 
+  /* Comoving density in internal units */
+  const float rho_com = hydro_get_comoving_density(p);
+
   /* Physical density in internal units */
-  const float rho = hydro_get_physical_density(p, cosmo);
+  const float rho_phys = hydro_get_physical_density(p, cosmo);
 
-  /* Critical density at this redshift.
-   * Recall that this is 0 in a non-cosmological run */
-  const float rho_crit = cosmo->critical_density;
-  const float rho_crit_baryon = cosmo->Omega_b * rho_crit;
+  /* Mean baryon density in co-moving internal units for over-density condition
+   * (Recall cosmo->critical_density_0 is 0 in a non-cosmological run,
+   * making the over-density condition a no-op) */
+  const float rho_crit_0 = cosmo->critical_density_0;
+  const float rho_crit_baryon = cosmo->Omega_b * rho_crit_0;
 
   /* Physical pressure */
   float pressure = 0.f;
 
   /* Are we in the regime of the Jeans equation of state? */
-  if ((rho >= rho_crit_baryon * props->Jeans_over_density_threshold) &&
-      (rho >= props->Jeans_density_threshold)) {
+  if ((rho_com >= rho_crit_baryon * props->Jeans_over_density_threshold) &&
+      (rho_phys >= props->Jeans_density_threshold)) {
 
-    const float pressure_Jeans = props->Jeans_pressure_norm *
-                                 powf(rho * props->Jeans_density_threshold_inv,
-                                      props->Jeans_gamma_effective);
+    const float pressure_Jeans =
+        props->Jeans_pressure_norm *
+        powf(rho_phys * props->Jeans_density_threshold_inv,
+             props->Jeans_gamma_effective);
 
     pressure = max(pressure, pressure_Jeans);
   }
 
   /* Are we in the regime of the Cool equation of state? */
-  if ((rho >= rho_crit_baryon * props->Cool_over_density_threshold) &&
-      (rho >= props->Cool_density_threshold)) {
+  if ((rho_com >= rho_crit_baryon * props->Cool_over_density_threshold) &&
+      (rho_phys >= props->Cool_density_threshold)) {
 
-    const float pressure_Cool = props->Cool_pressure_norm *
-                                powf(rho * props->Cool_density_threshold_inv,
-                                     props->Cool_gamma_effective);
+    const float pressure_Cool =
+        props->Cool_pressure_norm *
+        powf(rho_phys * props->Cool_density_threshold_inv,
+             props->Cool_gamma_effective);
 
     pressure = max(pressure, pressure_Cool);
   }
 
   /* Convert to an entropy.
    * (Recall that the entropy is the same in co-moving and phycial frames) */
-  return gas_entropy_from_pressure(rho, pressure);
+  return gas_entropy_from_pressure(rho_phys, pressure);
+}
+
+/**
+ * @brief Compute the temperature from the entropy floor for a given #part
+ *
+ * Calculate the EoS temperature, the particle is not updated.
+ * This is the temperature exactly corresponding to the imposed EoS shape.
+ * It only matches the entropy returned by the entropy_floor() function
+ * for a neutral gas with primoridal abundance.
+ *
+ * @param p The #part.
+ * @param cosmo The cosmological model.
+ * @param props The properties of the entropy floor.
+ */
+static INLINE float entropy_floor_temperature(
+    const struct part *p, const struct cosmology *cosmo,
+    const struct entropy_floor_properties *props) {
+
+  /* Comoving density in internal units */
+  const float rho_com = hydro_get_comoving_density(p);
+
+  /* Physical density in internal units */
+  const float rho_phys = hydro_get_physical_density(p, cosmo);
+
+  /* Mean baryon density in co-moving internal units for over-density condition
+   * (Recall cosmo->critical_density_0 is 0 in a non-cosmological run,
+   * making the over-density condition a no-op) */
+  const float rho_crit_0 = cosmo->critical_density_0;
+  const float rho_crit_baryon = cosmo->Omega_b * rho_crit_0;
+
+  /* Physical */
+  float temperature = 0.f;
+
+  /* Are we in the regime of the Jeans equation of state? */
+  if ((rho_com >= rho_crit_baryon * props->Jeans_over_density_threshold) &&
+      (rho_phys >= props->Jeans_density_threshold)) {
+
+    const float jeans_slope = props->Jeans_gamma_effective - 1.f;
+
+    const float temperature_Jeans =
+        props->Jeans_temperature_norm *
+        pow(rho_phys * props->Jeans_density_threshold_inv, jeans_slope);
+
+    temperature = max(temperature, temperature_Jeans);
+  }
+
+  /* Are we in the regime of the Cool equation of state? */
+  if ((rho_com >= rho_crit_baryon * props->Cool_over_density_threshold) &&
+      (rho_phys >= props->Cool_density_threshold)) {
+
+    const float cool_slope = props->Cool_gamma_effective - 1.f;
+
+    const float temperature_Cool =
+        props->Cool_temperature_norm *
+        pow(rho_phys * props->Cool_density_threshold_inv, cool_slope);
+
+    temperature = max(temperature, temperature_Cool);
+  }
+
+  return temperature;
 }
 
 /**
  * @brief Initialise the entropy floor by reading the parameters and converting
  * to internal units.
  *
+ * The input temperatures and number densities are converted to entropy and
+ * density assuming a neutral gas of primoridal abundance.
+ *
  * @param params The YAML parameter file.
  * @param us The system of units used internally.
  * @param phys_const The physical constants.
diff --git a/src/entropy_floor/none/entropy_floor.h b/src/entropy_floor/none/entropy_floor.h
index 871ef8977e091841128e280184646e3be02957fd..6ce5319c8c76cf8f9e6dc1716f383452d7cce7d6 100644
--- a/src/entropy_floor/none/entropy_floor.h
+++ b/src/entropy_floor/none/entropy_floor.h
@@ -52,6 +52,21 @@ static INLINE float entropy_floor(
   return 0.f;
 }
 
+/**
+ * @brief Compute the temperature from the entropy floor for a given #part
+ *
+ * Simply return 0 (no floor).
+ *
+ * @param p The #part.
+ * @param cosmo The cosmological model.
+ * @param props The properties of the entropy floor.
+ */
+static INLINE float entropy_floor_temperature(
+    const struct part *p, const struct cosmology *cosmo,
+    const struct entropy_floor_properties *props) {
+  return 0.f;
+}
+
 /**
  * @brief Initialise the entropy floor by reading the parameters and converting
  * to internal units.
diff --git a/src/exp10.h b/src/exp10.h
index b995bfdb3e1b6b1cb60bd4b60708413ea6c96f9f..fbae34af421c9d0bcc773fbfc50ac44df1e8fd42 100644
--- a/src/exp10.h
+++ b/src/exp10.h
@@ -25,11 +25,11 @@
 /* Some standard headers. */
 #include <math.h>
 
-#ifndef __GNUC__
-
 /* Local headers. */
 #include "inline.h"
 
+#if !defined(HAVE_EXP10) && !defined(HAVE___EXP10)
+
 /**
  * @brief Raises 10 to the power of the argument.
  *
@@ -44,6 +44,10 @@ __attribute__((always_inline, const)) INLINE static double exp10(
   return exp(x * M_LN10);
 }
 
+#endif
+
+#if !defined(HAVE_EXP10F) && !defined(HAVE___EXP10F)
+
 /**
  * @brief Raises 10 to the power of the argument.
  *
@@ -58,6 +62,15 @@ __attribute__((always_inline, const)) INLINE static float exp10f(
   return expf(x * (float)M_LN10);
 }
 
-#endif /* __GNUC__ */
+#endif
+
+/* Use the __exp10 and __exp10f versions if needed. */
+#if !defined(HAVE_EXP10) && defined(HAVE___EXP10)
+#define exp10(x) __exp10(x)
+#endif
+
+#if !defined(HAVE_EXP10F) && defined(HAVE___EXP10F)
+#define exp10f(x) __exp10f(x)
+#endif
 
 #endif /* SWIFT_EXP10_H */
diff --git a/src/hydro/AnarchyPU/hydro.h b/src/hydro/AnarchyPU/hydro.h
index 9bb53f290acb16b4f9efc44e430a78a6d1f5c5ff..37d182889b703df9ea6d98b63a6daa5dc85274a8 100644
--- a/src/hydro/AnarchyPU/hydro.h
+++ b/src/hydro/AnarchyPU/hydro.h
@@ -379,6 +379,45 @@ __attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
   xp->u_full = gas_internal_energy_from_entropy(p->rho, comoving_entropy);
 }
 
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part *p, struct xpart *xp,
+                                   const struct cosmology *cosmo,
+                                   const float u) {
+
+  xp->u_full = u / cosmo->a_factor_internal_energy;
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part *p,
+                                           const struct cosmology *cosmo,
+                                           const float u) {
+
+  p->u = u / cosmo->a_factor_internal_energy;
+
+  /* Now recompute the extra quantities */
+
+  /* Compute the sound speed */
+  const float soundspeed = hydro_get_comoving_soundspeed(p);
+
+  /* Update variables. */
+  p->force.soundspeed = soundspeed;
+}
+
 /**
  * @brief Computes the hydro time-step of a given particle
  *
@@ -693,11 +732,18 @@ __attribute__((always_inline)) INLINE static void hydro_prepare_force(
   const float sqrt_u = sqrtf(p->u);
   /* Calculate initial value of alpha dt before bounding */
   /* alpha_diff_dt is cosmology-less */
+  /* Evolution term: following Schaller+ 2015 */
   float alpha_diff_dt =
       hydro_props->diffusion.beta * p->h * p->diffusion.laplace_u / sqrt_u;
+  /* Decay term: not documented in Schaller+ 2015 but was present
+   * in the original EAGLE code and in Schaye+ 2015 */
+  alpha_diff_dt -=
+      (p->diffusion.alpha - hydro_props->diffusion.alpha_min) / tau;
 
-  float new_diffusion_alpha = p->diffusion.alpha + alpha_diff_dt * dt_alpha;
+  float new_diffusion_alpha = p->diffusion.alpha;
+  new_diffusion_alpha += alpha_diff_dt * dt_alpha;
 
+  /* Consistency checks to ensure min < alpha < max */
   if (new_diffusion_alpha > hydro_props->diffusion.alpha_max) {
     new_diffusion_alpha = hydro_props->diffusion.alpha_max;
   } else if (new_diffusion_alpha < hydro_props->diffusion.alpha_min) {
diff --git a/src/hydro/Default/hydro.h b/src/hydro/Default/hydro.h
index 2b1d19bc916889a5cfdc40b1357f1e3dfe9388af..175265dd4707be19e995e2ca6912629876ca2ca2 100644
--- a/src/hydro/Default/hydro.h
+++ b/src/hydro/Default/hydro.h
@@ -318,6 +318,62 @@ hydro_set_physical_internal_energy_dt(struct part *restrict p,
   p->force.u_dt = du_dt * cosmo->a_factor_internal_energy;
 }
 
+/**
+ * @brief Sets the physical entropy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param entropy The physical entropy
+ */
+__attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
+    struct part *p, struct xpart *xp, const struct cosmology *cosmo,
+    const float entropy) {
+
+  /* Note there is no conversion from physical to comoving entropy */
+  const float comoving_entropy = entropy;
+  xp->u_full = gas_internal_energy_from_entropy(p->rho, comoving_entropy);
+}
+
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part *p, struct xpart *xp,
+                                   const struct cosmology *cosmo,
+                                   const float u) {
+
+  xp->u_full = u / cosmo->a_factor_internal_energy;
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part *p,
+                                           const struct cosmology *cosmo,
+                                           const float u) {
+
+  p->u = u / cosmo->a_factor_internal_energy;
+
+  /* Now recompute the extra quantities */
+
+  /* Compute the sound speed */
+  const float soundspeed = hydro_get_comoving_soundspeed(p);
+
+  /* Update variables. */
+  p->force.soundspeed = soundspeed;
+}
+
 /**
  * @brief Computes the hydro time-step of a given particle
  *
diff --git a/src/hydro/Default/hydro_part.h b/src/hydro/Default/hydro_part.h
index 21c0269f78c85b7d11ab5e838d45614161aee013..2ff41da0a7825d2ddba276c3d20a9d2d4aad3224 100644
--- a/src/hydro/Default/hydro_part.h
+++ b/src/hydro/Default/hydro_part.h
@@ -21,6 +21,7 @@
 
 #include "chemistry_struct.h"
 #include "cooling_struct.h"
+#include "star_formation_struct.h"
 #include "tracers_struct.h"
 
 /* Extra particle data not needed during the SPH loops over neighbours. */
@@ -44,6 +45,9 @@ struct xpart {
   /* Additional data used by the tracers */
   struct tracers_xpart_data tracers_data;
 
+  /* Additional data used by the star formation */
+  struct star_formation_xpart_data sf_data;
+
   float u_full;
 
   /* Old density. */
diff --git a/src/hydro/Gadget2/hydro.h b/src/hydro/Gadget2/hydro.h
index 9994be7dc6051b033c052d32a4ebf3d7b59f1a84..bcef2480810c807d61a6545f04fca6144f90e8fe 100644
--- a/src/hydro/Gadget2/hydro.h
+++ b/src/hydro/Gadget2/hydro.h
@@ -331,6 +331,7 @@ hydro_set_physical_internal_energy_dt(struct part *restrict p,
   p->entropy_dt =
       gas_entropy_from_internal_energy(p->rho * cosmo->a3_inv, du_dt);
 }
+
 /**
  * @brief Sets the physical entropy of a particle
  *
@@ -347,6 +348,56 @@ __attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
   xp->entropy_full = entropy;
 }
 
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part *p, struct xpart *xp,
+                                   const struct cosmology *cosmo,
+                                   const float u) {
+
+  xp->entropy_full =
+      gas_entropy_from_internal_energy(p->rho * cosmo->a3_inv, u);
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part *p,
+                                           const struct cosmology *cosmo,
+                                           const float u) {
+
+  p->entropy = gas_entropy_from_internal_energy(p->rho * cosmo->a3_inv, u);
+
+  /* Now recompute the extra quantities */
+
+  /* Inverse of the co-moving density */
+  const float rho_inv = 1.f / p->rho;
+
+  /* Compute the pressure */
+  const float pressure = gas_pressure_from_entropy(p->rho, p->entropy);
+
+  /* Compute the sound speed */
+  const float soundspeed = gas_soundspeed_from_pressure(p->rho, pressure);
+
+  /* Divide the pressure by the density squared to get the SPH term */
+  const float P_over_rho2 = pressure * rho_inv * rho_inv;
+
+  /* Update variables. */
+  p->force.P_over_rho2 = P_over_rho2;
+  p->force.soundspeed = soundspeed;
+}
+
 /**
  * @brief Computes the hydro time-step of a given particle
  *
diff --git a/src/hydro/GizmoMFM/hydro.h b/src/hydro/GizmoMFM/hydro.h
index a4a54e7b551cc643bffedb8661f4fe269d348dc4..3456e6f9e0a4c1715951030a8b0a10c081d746bf 100644
--- a/src/hydro/GizmoMFM/hydro.h
+++ b/src/hydro/GizmoMFM/hydro.h
@@ -987,6 +987,35 @@ __attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
   error("Needs implementing");
 }
 
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part* p, struct xpart* xp,
+                                   const struct cosmology* cosmo,
+                                   const float u) {
+  error("Need implementing");
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part* p,
+                                           const struct cosmology* cosmo,
+                                           const float u) {
+  error("Need implementing");
+}
+
 /**
  * @brief Returns the comoving density of a particle
  *
diff --git a/src/hydro/GizmoMFV/hydro.h b/src/hydro/GizmoMFV/hydro.h
index 974f57ed68bbc409697111c52c40f36d4a5cb9b1..526d84289554f7e2f4cd183bbf82484f0804be28 100644
--- a/src/hydro/GizmoMFV/hydro.h
+++ b/src/hydro/GizmoMFV/hydro.h
@@ -1061,6 +1061,35 @@ __attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
   error("Needs implementing");
 }
 
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part* p, struct xpart* xp,
+                                   const struct cosmology* cosmo,
+                                   const float u) {
+  error("Need implementing");
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part* p,
+                                           const struct cosmology* cosmo,
+                                           const float u) {
+  error("Need implementing");
+}
+
 /**
  * @brief Returns the comoving density of a particle
  *
diff --git a/src/hydro/Minimal/hydro.h b/src/hydro/Minimal/hydro.h
index a5808468300da234a91a86feb897a9398e14db90..1d5d25f734acae72490ae42552abf65983463c07 100644
--- a/src/hydro/Minimal/hydro.h
+++ b/src/hydro/Minimal/hydro.h
@@ -354,6 +354,45 @@ __attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
   xp->u_full = gas_internal_energy_from_entropy(p->rho, comoving_entropy);
 }
 
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part *p, struct xpart *xp,
+                                   const struct cosmology *cosmo,
+                                   const float u) {
+
+  xp->u_full = u / cosmo->a_factor_internal_energy;
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part *p,
+                                           const struct cosmology *cosmo,
+                                           const float u) {
+
+  p->u = u / cosmo->a_factor_internal_energy;
+
+  /* Now recompute the extra quantities */
+
+  /* Compute the sound speed */
+  const float soundspeed = hydro_get_comoving_soundspeed(p);
+
+  /* Update variables. */
+  p->force.soundspeed = soundspeed;
+}
+
 /**
  * @brief Computes the hydro time-step of a given particle
  *
diff --git a/src/hydro/Planetary/hydro.h b/src/hydro/Planetary/hydro.h
index fbe0b6c8b9a8844cab3e38e485923fc7543ec528..e03b307bca754eb3a809613b20ebf3b1aae67a9f 100644
--- a/src/hydro/Planetary/hydro.h
+++ b/src/hydro/Planetary/hydro.h
@@ -378,6 +378,45 @@ __attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
       gas_internal_energy_from_entropy(p->rho, comoving_entropy, p->mat_id);
 }
 
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part *p, struct xpart *xp,
+                                   const struct cosmology *cosmo,
+                                   const float u) {
+
+  xp->u_full = u / cosmo->a_factor_internal_energy;
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part *p,
+                                           const struct cosmology *cosmo,
+                                           const float u) {
+
+  p->u = u / cosmo->a_factor_internal_energy;
+
+  /* Now recompute the extra quantities */
+
+  /* Compute the sound speed */
+  const float soundspeed = hydro_get_comoving_soundspeed(p);
+
+  /* Update variables. */
+  p->force.soundspeed = soundspeed;
+}
+
 /**
  * @brief Computes the hydro time-step of a given particle
  *
diff --git a/src/hydro/PressureEnergy/hydro.h b/src/hydro/PressureEnergy/hydro.h
index 4af00f7a657d61871dc0a82affb04d411e13e047..0e53b5f2ea12462fb1a618cda44934d113f655dd 100644
--- a/src/hydro/PressureEnergy/hydro.h
+++ b/src/hydro/PressureEnergy/hydro.h
@@ -379,6 +379,45 @@ __attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
   xp->u_full = gas_internal_energy_from_entropy(p->rho, comoving_entropy);
 }
 
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part *p, struct xpart *xp,
+                                   const struct cosmology *cosmo,
+                                   const float u) {
+
+  xp->u_full = u / cosmo->a_factor_internal_energy;
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part *p,
+                                           const struct cosmology *cosmo,
+                                           const float u) {
+
+  p->u = u / cosmo->a_factor_internal_energy;
+
+  /* Now recompute the extra quantities */
+
+  /* Compute the sound speed */
+  const float soundspeed = hydro_get_comoving_soundspeed(p);
+
+  /* Update variables. */
+  p->force.soundspeed = soundspeed;
+}
+
 /**
  * @brief Computes the hydro time-step of a given particle
  *
@@ -820,4 +859,22 @@ hydro_set_init_internal_energy(struct part *p, float u_init) {
 __attribute__((always_inline)) INLINE static void hydro_remove_part(
     const struct part *p, const struct xpart *xp) {}
 
+/**
+ * @brief Inputs extra heat to a particle at redshift of reionization
+ *
+ * We assume a constant density.
+ * @param p The particle of interest
+ * @param xp The extended particle data
+ * @param cosmo Cosmology data structure
+ * @param extra_heat The extra internal energy given to the particle.
+ */
+__attribute__((always_inline)) INLINE static void hydro_reion_heating(
+    struct part *p, struct xpart *xp, const struct cosmology *cosmo,
+    float extra_heat) {
+
+  const float old_u = xp->u_full * cosmo->a_factor_internal_energy;
+  const float new_u = old_u + extra_heat;
+  xp->u_full = new_u / cosmo->a_factor_internal_energy;
+}
+
 #endif /* SWIFT_PRESSURE_ENERGY_HYDRO_H */
diff --git a/src/hydro/PressureEnergyMorrisMonaghanAV/hydro.h b/src/hydro/PressureEnergyMorrisMonaghanAV/hydro.h
index b50ca4e2543af94573ff34954c26a23200b78a1d..9f981569e80021774cebaf11066ebdac2afc6f94 100644
--- a/src/hydro/PressureEnergyMorrisMonaghanAV/hydro.h
+++ b/src/hydro/PressureEnergyMorrisMonaghanAV/hydro.h
@@ -376,6 +376,45 @@ __attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
   xp->u_full = gas_internal_energy_from_entropy(p->rho, comoving_entropy);
 }
 
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part *p, struct xpart *xp,
+                                   const struct cosmology *cosmo,
+                                   const float u) {
+
+  xp->u_full = u / cosmo->a_factor_internal_energy;
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part *p,
+                                           const struct cosmology *cosmo,
+                                           const float u) {
+
+  p->u = u / cosmo->a_factor_internal_energy;
+
+  /* Now recompute the extra quantities */
+
+  /* Compute the sound speed */
+  const float soundspeed = hydro_get_comoving_soundspeed(p);
+
+  /* Update variables. */
+  p->force.soundspeed = soundspeed;
+}
+
 /**
  * @brief Computes the hydro time-step of a given particle
  *
diff --git a/src/hydro/PressureEntropy/hydro.h b/src/hydro/PressureEntropy/hydro.h
index 40b3f42eaed7cbff3c6503caa0fc8801d65ac8e3..578bebf635149fe29299800c2a4854c0158d3de9 100644
--- a/src/hydro/PressureEntropy/hydro.h
+++ b/src/hydro/PressureEntropy/hydro.h
@@ -150,6 +150,36 @@ __attribute__((always_inline)) INLINE static float hydro_get_physical_entropy(
   return xp->entropy_full;
 }
 
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical entropy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part *p, struct xpart *xp,
+                                   const struct cosmology *cosmo,
+                                   const float u) {
+  error("To be implemented");
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical entropy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part *p,
+                                           const struct cosmology *cosmo,
+                                           const float u) {
+  error("To be implemented");
+}
+
 /**
  * @brief Returns the comoving entropy of a particle drifted to the
  * current time.
diff --git a/src/hydro/Shadowswift/hydro.h b/src/hydro/Shadowswift/hydro.h
index b0f3207dfce69ca79899b1134740d035d47251d1..9ac89fa02a3663e521f54b4df0f15884b041fad6 100644
--- a/src/hydro/Shadowswift/hydro.h
+++ b/src/hydro/Shadowswift/hydro.h
@@ -826,6 +826,50 @@ hydro_get_physical_soundspeed(const struct part* restrict p,
   return cosmo->a_factor_sound_speed * hydro_get_comoving_soundspeed(p);
 }
 
+/**
+ * @brief Sets the physical entropy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param entropy The physical entropy
+ */
+__attribute__((always_inline)) INLINE static void hydro_set_physical_entropy(
+    struct part* p, struct xpart* xp, const struct cosmology* cosmo,
+    const float entropy) {
+
+  error("Needs implementing");
+}
+
+/**
+ * @brief Sets the physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param xp The extended particle data.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_physical_internal_energy(struct part* p, struct xpart* xp,
+                                   const struct cosmology* cosmo,
+                                   const float u) {
+  error("Need implementing");
+}
+
+/**
+ * @brief Sets the drifted physical internal energy of a particle
+ *
+ * @param p The particle of interest.
+ * @param cosmo Cosmology data structure
+ * @param u The physical internal energy
+ */
+__attribute__((always_inline)) INLINE static void
+hydro_set_drifted_physical_internal_energy(struct part* p,
+                                           const struct cosmology* cosmo,
+                                           const float u) {
+  error("Need implementing");
+}
+
 /**
  * @brief Returns the comoving pressure of a particle
  *
diff --git a/src/hydro_properties.c b/src/hydro_properties.c
index f14c88bfb5128c1da17590f50698e5d038734b71..ff578aec139ad06cb80279d8d827a41975f9773f 100644
--- a/src/hydro_properties.c
+++ b/src/hydro_properties.c
@@ -317,6 +317,12 @@ void hydro_props_print_snapshot(hid_t h_grpsph, const struct hydro_props *p) {
   io_write_attribute_f(h_grpsph, "Beta viscosity", const_viscosity_beta);
   io_write_attribute_f(h_grpsph, "Max v_sig ratio (limiter)",
                        const_limiter_max_v_sig_ratio);
+  io_write_attribute_f(h_grpsph, "Diffusion alpha", p->diffusion.alpha);
+  io_write_attribute_f(h_grpsph, "Diffusion alpha (max)",
+                       p->diffusion.alpha_max);
+  io_write_attribute_f(h_grpsph, "Diffusion alpha (min)",
+                       p->diffusion.alpha_min);
+  io_write_attribute_f(h_grpsph, "Diffusion beta", p->diffusion.beta);
 }
 #endif
 
diff --git a/src/runner.c b/src/runner.c
index 4cac34538858da3882f1ac6a6c70d45d9842a022..75a181fa01fd8defbdc861f266fc892bd7bb60d9 100644
--- a/src/runner.c
+++ b/src/runner.c
@@ -75,6 +75,7 @@
 #define TASK_LOOP_GRADIENT 1
 #define TASK_LOOP_FORCE 2
 #define TASK_LOOP_LIMITER 3
+#define TASK_LOOP_FEEDBACK 4
 
 /* Import the density loop functions. */
 #define FUNCTION density
@@ -111,14 +112,16 @@
 
 /* Import the stars density loop functions. */
 #define FUNCTION density
-#define UPDATE_STARS 1
+#define FUNCTION_TASK_LOOP TASK_LOOP_DENSITY
 #include "runner_doiact_stars.h"
-#undef UPDATE_STARS
+#undef FUNCTION_TASK_LOOP
 #undef FUNCTION
 
 /* Import the stars feedback loop functions. */
 #define FUNCTION feedback
+#define FUNCTION_TASK_LOOP TASK_LOOP_FEEDBACK
 #include "runner_doiact_stars.h"
+#undef FUNCTION_TASK_LOOP
 #undef FUNCTION
 
 /**
@@ -578,6 +581,7 @@ void runner_do_star_formation(struct runner *r, struct cell *c, int timer) {
   const struct hydro_props *restrict hydro_props = e->hydro_properties;
   const struct unit_system *restrict us = e->internal_units;
   struct cooling_function_data *restrict cooling = e->cooling_func;
+  const struct entropy_floor_properties *entropy_floor = e->entropy_floor;
   const double time_base = e->time_base;
   const integertime_t ti_current = e->ti_current;
   const int current_stars_count = c->stars.count;
@@ -605,7 +609,8 @@ void runner_do_star_formation(struct runner *r, struct cell *c, int timer) {
 
         /* Is this particle star forming? */
         if (star_formation_is_star_forming(p, xp, sf_props, phys_const, cosmo,
-                                           hydro_props, us, cooling)) {
+                                           hydro_props, us, cooling,
+                                           entropy_floor)) {
 
           /* Time-step size for this particle */
           double dt_star;
@@ -1446,9 +1451,9 @@ void runner_do_ghost(struct runner *r, struct cell *c, int timer) {
               ((p->h <= hydro_h_min) && (f > 0.f))) {
 
           /* We have a particle whose smoothing length is already set (wants
-           * to be larger but has already hit the maximum OR wants to be smaller
-           * but has already reached the minimum). So, just tidy up as if the
-           * smoothing length had converged correctly  */
+           * to be larger but has already hit the maximum OR wants to be
+           * smaller but has already reached the minimum). So, just tidy up as
+           * if the smoothing length had converged correctly  */
 
 #ifdef EXTRA_HYDRO_LOOP
 
diff --git a/src/runner_doiact_stars.h b/src/runner_doiact_stars.h
index f208f14ac98a31a55df6741a2cc5f9cb0a829762..e56d3b9460381e8408f370cae33e64fb93ecd541 100644
--- a/src/runner_doiact_stars.h
+++ b/src/runner_doiact_stars.h
@@ -28,15 +28,23 @@
 #define _DOSELF1_STARS(f) PASTE(runner_doself_stars, f)
 #define DOSELF1_STARS _DOSELF1_STARS(FUNCTION)
 
-#define _DO_NONSYM_PAIR1_STARS(f) PASTE(runner_do_nonsym_pair_stars, f)
-#define DO_NONSYM_PAIR1_STARS _DO_NONSYM_PAIR1_STARS(FUNCTION)
+#define _DO_SYM_PAIR1_STARS(f) PASTE(runner_do_sym_pair_stars, f)
+#define DO_SYM_PAIR1_STARS _DO_SYM_PAIR1_STARS(FUNCTION)
 
-#define _DOPAIR1_STARS(f) PASTE(runner_dopair_stars, f)
-#define DOPAIR1_STARS _DOPAIR1_STARS(FUNCTION)
+#define _DO_NONSYM_PAIR1_STARS_NAIVE(f) \
+  PASTE(runner_do_nonsym_pair_stars_naive, f)
+#define DO_NONSYM_PAIR1_STARS_NAIVE _DO_NONSYM_PAIR1_STARS_NAIVE(FUNCTION)
+
+#define _DOPAIR1_STARS_NAIVE(f) PASTE(runner_dopair_stars_naive, f)
+#define DOPAIR1_STARS_NAIVE _DOPAIR1_STARS_NAIVE(FUNCTION)
 
 #define _DOPAIR1_SUBSET_STARS(f) PASTE(runner_dopair_subset_stars, f)
 #define DOPAIR1_SUBSET_STARS _DOPAIR1_SUBSET_STARS(FUNCTION)
 
+#define _DOPAIR1_SUBSET_STARS_NAIVE(f) \
+  PASTE(runner_dopair_subset_stars_naive, f)
+#define DOPAIR1_SUBSET_STARS_NAIVE _DOPAIR1_SUBSET_STARS_NAIVE(FUNCTION)
+
 #define _DOSELF1_SUBSET_STARS(f) PASTE(runner_doself_subset_stars, f)
 #define DOSELF1_SUBSET_STARS _DOSELF1_SUBSET_STARS(FUNCTION)
 
@@ -83,8 +91,8 @@ void DOSELF1_STARS(struct runner *r, struct cell *c, int timer) {
   const struct cosmology *cosmo = e->cosmology;
 
   /* Anything to do here? */
+  if (c->hydro.count == 0 || c->stars.count == 0) return;
   if (!cell_is_active_stars(c, e)) return;
-  if (c->hydro.count == 0 && c->stars.count == 0) return;
 
   /* Cosmological terms */
   const float a = cosmo->a;
@@ -100,7 +108,7 @@ void DOSELF1_STARS(struct runner *r, struct cell *c, int timer) {
 
     /* Get a hold of the ith spart in ci. */
     struct spart *restrict si = &sparts[sid];
-    if (!spart_is_active(si, e) || spart_is_inhibited(si, e)) continue;
+    if (!spart_is_active(si, e)) continue;
 
     const float hi = si->h;
     const float hig2 = hi * hi * kernel_gamma2;
@@ -113,7 +121,9 @@ void DOSELF1_STARS(struct runner *r, struct cell *c, int timer) {
 
       /* Get a pointer to the jth particle. */
       struct part *restrict pj = &parts[pjd];
-      const float hj = pj->h;
+
+      /* Early abort? */
+      if (part_is_inhibited(pj, e)) continue;
 
       /* Compute the pairwise distance. */
       const float pjx[3] = {(float)(pj->x[0] - c->loc[0]),
@@ -128,8 +138,8 @@ void DOSELF1_STARS(struct runner *r, struct cell *c, int timer) {
         error("Particle pj not drifted to current time");
 #endif
 
-      if (r2 > 0.f && r2 < hig2) {
-        IACT_STARS(r2, dx, hi, hj, si, pj, a, H);
+      if (r2 < hig2) {
+        IACT_STARS(r2, dx, hi, pj->h, si, pj, a, H);
       }
     } /* loop over the parts in ci. */
   }   /* loop over the sparts in ci. */
@@ -142,11 +152,11 @@ void DOSELF1_STARS(struct runner *r, struct cell *c, int timer) {
  * @param ci The first #cell
  * @param cj The second #cell
  */
-void DO_NONSYM_PAIR1_STARS(struct runner *r, struct cell *restrict ci,
-                           struct cell *restrict cj) {
+void DO_NONSYM_PAIR1_STARS_NAIVE(struct runner *r, struct cell *restrict ci,
+                                 struct cell *restrict cj) {
 
 #ifdef SWIFT_DEBUG_CHECKS
-#ifdef UPDATE_STARS
+#if (FUNCTION_TASK_LOOP == TASK_LOOP_DENSITY)
   if (ci->nodeID != engine_rank) error("Should be run on a different node");
 #else
   if (cj->nodeID != engine_rank) error("Should be run on a different node");
@@ -157,6 +167,7 @@ void DO_NONSYM_PAIR1_STARS(struct runner *r, struct cell *restrict ci,
   const struct cosmology *cosmo = e->cosmology;
 
   /* Anything to do here? */
+  if (cj->hydro.count == 0 || ci->stars.count == 0) return;
   if (!cell_is_active_stars(ci, e)) return;
 
   const int scount_i = ci->stars.count;
@@ -182,7 +193,8 @@ void DO_NONSYM_PAIR1_STARS(struct runner *r, struct cell *restrict ci,
 
     /* Get a hold of the ith spart in ci. */
     struct spart *restrict si = &sparts_i[sid];
-    if (!spart_is_active(si, e) || spart_is_inhibited(si, e)) continue;
+    if (!spart_is_active(si, e)) continue;
+
     const float hi = si->h;
     const float hig2 = hi * hi * kernel_gamma2;
     const float six[3] = {(float)(si->x[0] - (cj->loc[0] + shift[0])),
@@ -194,7 +206,9 @@ void DO_NONSYM_PAIR1_STARS(struct runner *r, struct cell *restrict ci,
 
       /* Get a pointer to the jth particle. */
       struct part *restrict pj = &parts_j[pjd];
-      const float hj = pj->h;
+
+      /* Skip inhibited particles. */
+      if (part_is_inhibited(pj, e)) continue;
 
       /* Compute the pairwise distance. */
       const float pjx[3] = {(float)(pj->x[0] - cj->loc[0]),
@@ -209,27 +223,297 @@ void DO_NONSYM_PAIR1_STARS(struct runner *r, struct cell *restrict ci,
         error("Particle pj not drifted to current time");
 #endif
 
-      if (r2 < hig2) IACT_STARS(r2, dx, hi, hj, si, pj, a, H);
+      if (r2 < hig2) IACT_STARS(r2, dx, hi, pj->h, si, pj, a, H);
 
     } /* loop over the parts in cj. */
   }   /* loop over the parts in ci. */
 }
 
-void DOPAIR1_STARS(struct runner *r, struct cell *restrict ci,
-                   struct cell *restrict cj, int timer) {
+/**
+ * @brief Compute the interactions between a cell pair.
+ *
+ * @param r The #runner.
+ * @param ci The first #cell.
+ * @param cj The second #cell.
+ * @param sid The direction of the pair.
+ * @param shift The shift vector to apply to the particles in ci.
+ */
+void DO_SYM_PAIR1_STARS(struct runner *r, struct cell *ci, struct cell *cj,
+                        const int sid, const double *shift) {
+
+  const struct engine *restrict e = r->e;
+  const struct cosmology *restrict cosmo = e->cosmology;
+
+  /* Get the cutoff shift. */
+  double rshift = 0.0;
+  for (int k = 0; k < 3; k++) rshift += shift[k] * runner_shift[sid][k];
+
+  /* Cosmological terms */
+  const float a = cosmo->a;
+  const float H = cosmo->H;
+
+#if (FUNCTION_TASK_LOOP == TASK_LOOP_DENSITY)
+  const int do_ci_stars = (ci->nodeID == e->nodeID) && (ci->stars.count != 0) &&
+                          (cj->hydro.count != 0) && cell_is_active_stars(ci, e);
+  const int do_cj_stars = (cj->nodeID == e->nodeID) && (cj->stars.count != 0) &&
+                          (ci->hydro.count != 0) && cell_is_active_stars(cj, e);
+#else
+  /* here we are updating the hydro -> switch ci, cj for local */
+  const int do_ci_stars = (cj->nodeID == e->nodeID) && (ci->stars.count != 0) &&
+                          (cj->hydro.count != 0) && cell_is_active_stars(ci, e);
+  const int do_cj_stars = (ci->nodeID == e->nodeID) && (cj->stars.count != 0) &&
+                          (ci->hydro.count != 0) && cell_is_active_stars(cj, e);
+#endif
+
+  if (do_ci_stars) {
+
+    /* Pick-out the sorted lists. */
+    const struct entry *restrict sort_j = cj->hydro.sort[sid];
+    const struct entry *restrict sort_i = ci->stars.sort[sid];
+
+#ifdef SWIFT_DEBUG_CHECKS
+    /* Some constants used to checks that the parts are in the right frame */
+    const float shift_threshold_x =
+        2. * ci->width[0] +
+        2. * max(ci->stars.dx_max_part, cj->hydro.dx_max_part);
+    const float shift_threshold_y =
+        2. * ci->width[1] +
+        2. * max(ci->stars.dx_max_part, cj->hydro.dx_max_part);
+    const float shift_threshold_z =
+        2. * ci->width[2] +
+        2. * max(ci->stars.dx_max_part, cj->hydro.dx_max_part);
+#endif /* SWIFT_DEBUG_CHECKS */
+
+    /* Get some other useful values. */
+    const double hi_max = ci->stars.h_max * kernel_gamma - rshift;
+    const int count_i = ci->stars.count;
+    const int count_j = cj->hydro.count;
+    struct spart *restrict sparts_i = ci->stars.parts;
+    struct part *restrict parts_j = cj->hydro.parts;
+    const double dj_min = sort_j[0].d;
+    const float dx_max_rshift =
+        (ci->stars.dx_max_sort + cj->hydro.dx_max_sort) - rshift;
+    const float dx_max = (ci->stars.dx_max_sort + cj->hydro.dx_max_sort);
+
+    /* Loop over the sparts in ci. */
+    for (int pid = count_i - 1;
+         pid >= 0 && sort_i[pid].d + hi_max + dx_max > dj_min; pid--) {
+
+      /* Get a hold of the ith part in ci. */
+      struct spart *restrict spi = &sparts_i[sort_i[pid].i];
+      const float hi = spi->h;
+
+      /* Skip inactive particles */
+      if (!spart_is_active(spi, e)) continue;
+
+      /* Compute distance from the other cell. */
+      const double px[3] = {spi->x[0], spi->x[1], spi->x[2]};
+      float dist = px[0] * runner_shift[sid][0] + px[1] * runner_shift[sid][1] +
+                   px[2] * runner_shift[sid][2];
+
+      /* Is there anything we need to interact with ? */
+      const double di = dist + hi * kernel_gamma + dx_max_rshift;
+      if (di < dj_min) continue;
+
+      /* Get some additional information about pi */
+      const float hig2 = hi * hi * kernel_gamma2;
+      const float pix = spi->x[0] - (cj->loc[0] + shift[0]);
+      const float piy = spi->x[1] - (cj->loc[1] + shift[1]);
+      const float piz = spi->x[2] - (cj->loc[2] + shift[2]);
+
+      /* Loop over the parts in cj. */
+      for (int pjd = 0; pjd < count_j && sort_j[pjd].d < di; pjd++) {
+
+        /* Recover pj */
+        struct part *pj = &parts_j[sort_j[pjd].i];
+
+        /* Skip inhibited particles. */
+        if (part_is_inhibited(pj, e)) continue;
+
+        const float hj = pj->h;
+        const float pjx = pj->x[0] - cj->loc[0];
+        const float pjy = pj->x[1] - cj->loc[1];
+        const float pjz = pj->x[2] - cj->loc[2];
+
+        /* Compute the pairwise distance. */
+        float dx[3] = {pix - pjx, piy - pjy, piz - pjz};
+        const float r2 = dx[0] * dx[0] + dx[1] * dx[1] + dx[2] * dx[2];
+
+#ifdef SWIFT_DEBUG_CHECKS
+        /* Check that particles are in the correct frame after the shifts */
+        if (pix > shift_threshold_x || pix < -shift_threshold_x)
+          error(
+              "Invalid particle position in X for pi (pix=%e ci->width[0]=%e)",
+              pix, ci->width[0]);
+        if (piy > shift_threshold_y || piy < -shift_threshold_y)
+          error(
+              "Invalid particle position in Y for pi (piy=%e ci->width[1]=%e)",
+              piy, ci->width[1]);
+        if (piz > shift_threshold_z || piz < -shift_threshold_z)
+          error(
+              "Invalid particle position in Z for pi (piz=%e ci->width[2]=%e)",
+              piz, ci->width[2]);
+        if (pjx > shift_threshold_x || pjx < -shift_threshold_x)
+          error(
+              "Invalid particle position in X for pj (pjx=%e ci->width[0]=%e)",
+              pjx, ci->width[0]);
+        if (pjy > shift_threshold_y || pjy < -shift_threshold_y)
+          error(
+              "Invalid particle position in Y for pj (pjy=%e ci->width[1]=%e)",
+              pjy, ci->width[1]);
+        if (pjz > shift_threshold_z || pjz < -shift_threshold_z)
+          error(
+              "Invalid particle position in Z for pj (pjz=%e ci->width[2]=%e)",
+              pjz, ci->width[2]);
+
+        /* Check that particles have been drifted to the current time */
+        if (spi->ti_drift != e->ti_current)
+          error("Particle spi not drifted to current time");
+        if (pj->ti_drift != e->ti_current)
+          error("Particle pj not drifted to current time");
+#endif
+
+        /* Hit or miss? */
+        if (r2 < hig2) {
+
+          IACT_STARS(r2, dx, hi, hj, spi, pj, a, H);
+        }
+      } /* loop over the parts in cj. */
+    }   /* loop over the parts in ci. */
+  }     /* do_ci_stars */
+
+  if (do_cj_stars) {
+    /* Pick-out the sorted lists. */
+    const struct entry *restrict sort_i = ci->hydro.sort[sid];
+    const struct entry *restrict sort_j = cj->stars.sort[sid];
+
+#ifdef SWIFT_DEBUG_CHECKS
+    /* Some constants used to checks that the parts are in the right frame */
+    const float shift_threshold_x =
+        2. * ci->width[0] +
+        2. * max(ci->hydro.dx_max_part, cj->stars.dx_max_part);
+    const float shift_threshold_y =
+        2. * ci->width[1] +
+        2. * max(ci->hydro.dx_max_part, cj->stars.dx_max_part);
+    const float shift_threshold_z =
+        2. * ci->width[2] +
+        2. * max(ci->hydro.dx_max_part, cj->stars.dx_max_part);
+#endif /* SWIFT_DEBUG_CHECKS */
+
+    /* Get some other useful values. */
+    const double hj_max = cj->hydro.h_max * kernel_gamma;
+    const int count_i = ci->hydro.count;
+    const int count_j = cj->stars.count;
+    struct part *restrict parts_i = ci->hydro.parts;
+    struct spart *restrict sparts_j = cj->stars.parts;
+    const double di_max = sort_i[count_i - 1].d - rshift;
+    const float dx_max_rshift =
+        (ci->hydro.dx_max_sort + cj->stars.dx_max_sort) + rshift;
+    const float dx_max = (ci->hydro.dx_max_sort + cj->stars.dx_max_sort);
+
+    /* Loop over the parts in cj. */
+    for (int pjd = 0; pjd < count_j && sort_j[pjd].d - hj_max - dx_max < di_max;
+         pjd++) {
+
+      /* Get a hold of the jth part in cj. */
+      struct spart *spj = &sparts_j[sort_j[pjd].i];
+      const float hj = spj->h;
+
+      /* Skip inactive particles */
+      if (!spart_is_active(spj, e)) continue;
+
+      /* Compute distance from the other cell. */
+      const double px[3] = {spj->x[0], spj->x[1], spj->x[2]};
+      float dist = px[0] * runner_shift[sid][0] + px[1] * runner_shift[sid][1] +
+                   px[2] * runner_shift[sid][2];
+
+      /* Is there anything we need to interact with ? */
+      const double dj = dist - hj * kernel_gamma - dx_max_rshift;
+      if (dj - rshift > di_max) continue;
+
+      /* Get some additional information about pj */
+      const float hjg2 = hj * hj * kernel_gamma2;
+      const float pjx = spj->x[0] - cj->loc[0];
+      const float pjy = spj->x[1] - cj->loc[1];
+      const float pjz = spj->x[2] - cj->loc[2];
+
+      /* Loop over the parts in ci. */
+      for (int pid = count_i - 1; pid >= 0 && sort_i[pid].d > dj; pid--) {
+
+        /* Recover pi */
+        struct part *pi = &parts_i[sort_i[pid].i];
+
+        /* Skip inhibited particles. */
+        if (part_is_inhibited(pi, e)) continue;
+
+        const float hi = pi->h;
+        const float pix = pi->x[0] - (cj->loc[0] + shift[0]);
+        const float piy = pi->x[1] - (cj->loc[1] + shift[1]);
+        const float piz = pi->x[2] - (cj->loc[2] + shift[2]);
+
+        /* Compute the pairwise distance. */
+        float dx[3] = {pjx - pix, pjy - piy, pjz - piz};
+        const float r2 = dx[0] * dx[0] + dx[1] * dx[1] + dx[2] * dx[2];
+
+#ifdef SWIFT_DEBUG_CHECKS
+        /* Check that particles are in the correct frame after the shifts */
+        if (pix > shift_threshold_x || pix < -shift_threshold_x)
+          error(
+              "Invalid particle position in X for pi (pix=%e ci->width[0]=%e)",
+              pix, ci->width[0]);
+        if (piy > shift_threshold_y || piy < -shift_threshold_y)
+          error(
+              "Invalid particle position in Y for pi (piy=%e ci->width[1]=%e)",
+              piy, ci->width[1]);
+        if (piz > shift_threshold_z || piz < -shift_threshold_z)
+          error(
+              "Invalid particle position in Z for pi (piz=%e ci->width[2]=%e)",
+              piz, ci->width[2]);
+        if (pjx > shift_threshold_x || pjx < -shift_threshold_x)
+          error(
+              "Invalid particle position in X for pj (pjx=%e ci->width[0]=%e)",
+              pjx, ci->width[0]);
+        if (pjy > shift_threshold_y || pjy < -shift_threshold_y)
+          error(
+              "Invalid particle position in Y for pj (pjy=%e ci->width[1]=%e)",
+              pjy, ci->width[1]);
+        if (pjz > shift_threshold_z || pjz < -shift_threshold_z)
+          error(
+              "Invalid particle position in Z for pj (pjz=%e ci->width[2]=%e)",
+              pjz, ci->width[2]);
+
+        /* Check that particles have been drifted to the current time */
+        if (pi->ti_drift != e->ti_current)
+          error("Particle pi not drifted to current time");
+        if (spj->ti_drift != e->ti_current)
+          error("Particle spj not drifted to current time");
+#endif
+
+        /* Hit or miss? */
+        if (r2 < hjg2) {
+
+          IACT_STARS(r2, dx, hj, hi, spj, pi, a, H);
+        }
+      } /* loop over the parts in ci. */
+    }   /* loop over the parts in cj. */
+  }     /* Cell cj is active */
+}
+
+void DOPAIR1_STARS_NAIVE(struct runner *r, struct cell *restrict ci,
+                         struct cell *restrict cj, int timer) {
 
-#ifdef UPDATE_STARS
-  const int ci_local = ci->nodeID == engine_rank;
-  const int cj_local = cj->nodeID == engine_rank;
+#if (FUNCTION_TASK_LOOP == TASK_LOOP_DENSITY)
+  const int do_ci_stars = ci->nodeID == r->e->nodeID;
+  const int do_cj_stars = cj->nodeID == r->e->nodeID;
 #else
   /* here we are updating the hydro -> switch ci, cj */
-  const int ci_local = cj->nodeID == engine_rank;
-  const int cj_local = ci->nodeID == engine_rank;
+  const int do_ci_stars = cj->nodeID == r->e->nodeID;
+  const int do_cj_stars = ci->nodeID == r->e->nodeID;
 #endif
-  if (ci_local && ci->stars.count != 0 && cj->hydro.count != 0)
-    DO_NONSYM_PAIR1_STARS(r, ci, cj);
-  if (cj_local && cj->stars.count != 0 && ci->hydro.count != 0)
-    DO_NONSYM_PAIR1_STARS(r, cj, ci);
+  if (do_ci_stars && ci->stars.count != 0 && cj->hydro.count != 0)
+    DO_NONSYM_PAIR1_STARS_NAIVE(r, ci, cj);
+  if (do_cj_stars && cj->stars.count != 0 && ci->hydro.count != 0)
+    DO_NONSYM_PAIR1_STARS_NAIVE(r, cj, ci);
 }
 
 /**
@@ -244,12 +528,151 @@ void DOPAIR1_STARS(struct runner *r, struct cell *restrict ci,
  * @param ind The list of indices of particles in @c ci to interact with.
  * @param scount The number of particles in @c ind.
  * @param cj The second #cell.
+ * @param sid The direction of the pair.
+ * @param flipped Flag to check whether the cells have been flipped or not.
  * @param shift The shift vector to apply to the particles in ci.
  */
 void DOPAIR1_SUBSET_STARS(struct runner *r, struct cell *restrict ci,
                           struct spart *restrict sparts_i, int *restrict ind,
-                          int scount, struct cell *restrict cj,
-                          const double *shift) {
+                          int scount, struct cell *restrict cj, const int sid,
+                          const int flipped, const double *shift) {
+
+  const struct engine *e = r->e;
+  const struct cosmology *cosmo = e->cosmology;
+
+  const int count_j = cj->hydro.count;
+  struct part *restrict parts_j = cj->hydro.parts;
+
+  /* Early abort? */
+  if (count_j == 0) return;
+
+  /* Cosmological terms */
+  const float a = cosmo->a;
+  const float H = cosmo->H;
+
+  /* Pick-out the sorted lists. */
+  const struct entry *restrict sort_j = cj->hydro.sort[sid];
+  const float dxj = cj->hydro.dx_max_sort;
+
+  /* Sparts are on the left? */
+  if (!flipped) {
+
+    /* Loop over the sparts_i. */
+    for (int pid = 0; pid < scount; pid++) {
+
+      /* Get a hold of the ith spart in ci. */
+      struct spart *restrict spi = &sparts_i[ind[pid]];
+      const double pix = spi->x[0] - (shift[0]);
+      const double piy = spi->x[1] - (shift[1]);
+      const double piz = spi->x[2] - (shift[2]);
+      const float hi = spi->h;
+      const float hig2 = hi * hi * kernel_gamma2;
+      const double di = hi * kernel_gamma + dxj + pix * runner_shift[sid][0] +
+                        piy * runner_shift[sid][1] + piz * runner_shift[sid][2];
+
+      /* Loop over the parts in cj. */
+      for (int pjd = 0; pjd < count_j && sort_j[pjd].d < di; pjd++) {
+
+        /* Get a pointer to the jth particle. */
+        struct part *restrict pj = &parts_j[sort_j[pjd].i];
+
+        /* Skip inhibited particles. */
+        if (part_is_inhibited(pj, e)) continue;
+
+        const double pjx = pj->x[0];
+        const double pjy = pj->x[1];
+        const double pjz = pj->x[2];
+
+        /* Compute the pairwise distance. */
+        float dx[3] = {(float)(pix - pjx), (float)(piy - pjy),
+                       (float)(piz - pjz)};
+        const float r2 = dx[0] * dx[0] + dx[1] * dx[1] + dx[2] * dx[2];
+
+#ifdef SWIFT_DEBUG_CHECKS
+        /* Check that particles have been drifted to the current time */
+        if (spi->ti_drift != e->ti_current)
+          error("Particle pi not drifted to current time");
+        if (pj->ti_drift != e->ti_current)
+          error("Particle pj not drifted to current time");
+#endif
+
+        /* Hit or miss? */
+        if (r2 < hig2) {
+          IACT_STARS(r2, dx, hi, pj->h, spi, pj, a, H);
+        }
+      } /* loop over the parts in cj. */
+    }   /* loop over the sparts in ci. */
+  }
+
+  /* Sparts are on the right. */
+  else {
+
+    /* Loop over the sparts_i. */
+    for (int pid = 0; pid < scount; pid++) {
+
+      /* Get a hold of the ith spart in ci. */
+      struct spart *restrict spi = &sparts_i[ind[pid]];
+      const double pix = spi->x[0] - (shift[0]);
+      const double piy = spi->x[1] - (shift[1]);
+      const double piz = spi->x[2] - (shift[2]);
+      const float hi = spi->h;
+      const float hig2 = hi * hi * kernel_gamma2;
+      const double di = -hi * kernel_gamma - dxj + pix * runner_shift[sid][0] +
+                        piy * runner_shift[sid][1] + piz * runner_shift[sid][2];
+
+      /* Loop over the parts in cj. */
+      for (int pjd = count_j - 1; pjd >= 0 && di < sort_j[pjd].d; pjd--) {
+
+        /* Get a pointer to the jth particle. */
+        struct part *restrict pj = &parts_j[sort_j[pjd].i];
+
+        /* Skip inhibited particles. */
+        if (part_is_inhibited(pj, e)) continue;
+
+        const double pjx = pj->x[0];
+        const double pjy = pj->x[1];
+        const double pjz = pj->x[2];
+
+        /* Compute the pairwise distance. */
+        float dx[3] = {(float)(pix - pjx), (float)(piy - pjy),
+                       (float)(piz - pjz)};
+        const float r2 = dx[0] * dx[0] + dx[1] * dx[1] + dx[2] * dx[2];
+
+#ifdef SWIFT_DEBUG_CHECKS
+        /* Check that particles have been drifted to the current time */
+        if (spi->ti_drift != e->ti_current)
+          error("Particle pi not drifted to current time");
+        if (pj->ti_drift != e->ti_current)
+          error("Particle pj not drifted to current time");
+#endif
+
+        /* Hit or miss? */
+        if (r2 < hig2) {
+          IACT_STARS(r2, dx, hi, pj->h, spi, pj, a, H);
+        }
+      } /* loop over the parts in cj. */
+    }   /* loop over the sparts in ci. */
+  }
+}
+
+/**
+ * @brief Compute the interactions between a cell pair, but only for the
+ *      given indices in ci.
+ *
+ * Version using a brute-force algorithm.
+ *
+ * @param r The #runner.
+ * @param ci The first #cell.
+ * @param sparts_i The #part to interact with @c cj.
+ * @param ind The list of indices of particles in @c ci to interact with.
+ * @param scount The number of particles in @c ind.
+ * @param cj The second #cell.
+ * @param shift The shift vector to apply to the particles in ci.
+ */
+void DOPAIR1_SUBSET_STARS_NAIVE(struct runner *r, struct cell *restrict ci,
+                                struct spart *restrict sparts_i,
+                                int *restrict ind, int scount,
+                                struct cell *restrict cj, const double *shift) {
 
 #ifdef SWIFT_DEBUG_CHECKS
   if (ci->nodeID != engine_rank) error("Should be run on a different node");
@@ -260,6 +683,9 @@ void DOPAIR1_SUBSET_STARS(struct runner *r, struct cell *restrict ci,
   const int count_j = cj->hydro.count;
   struct part *restrict parts_j = cj->hydro.parts;
 
+  /* Early abort? */
+  if (count_j == 0) return;
+
   /* Cosmological terms */
   const float a = cosmo->a;
   const float H = cosmo->H;
@@ -285,6 +711,9 @@ void DOPAIR1_SUBSET_STARS(struct runner *r, struct cell *restrict ci,
       /* Get a pointer to the jth particle. */
       struct part *restrict pj = &parts_j[pjd];
 
+      /* Skip inhibited particles */
+      if (part_is_inhibited(pj, e)) continue;
+
       /* Compute the pairwise distance. */
       float r2 = 0.0f;
       float dx[3];
@@ -334,6 +763,9 @@ void DOSELF1_SUBSET_STARS(struct runner *r, struct cell *restrict ci,
   const int count_i = ci->hydro.count;
   struct part *restrict parts_j = ci->hydro.parts;
 
+  /* Early abort? */
+  if (count_i == 0) return;
+
   /* Loop over the parts in ci. */
   for (int spid = 0; spid < scount; spid++) {
 
@@ -355,7 +787,9 @@ void DOSELF1_SUBSET_STARS(struct runner *r, struct cell *restrict ci,
 
       /* Get a pointer to the jth particle. */
       struct part *restrict pj = &parts_j[pjd];
-      const float hj = pj->h;
+
+      /* Early abort? */
+      if (part_is_inhibited(pj, e)) continue;
 
       /* Compute the pairwise distance. */
       const float pjx[3] = {(float)(pj->x[0] - ci->loc[0]),
@@ -371,8 +805,8 @@ void DOSELF1_SUBSET_STARS(struct runner *r, struct cell *restrict ci,
 #endif
 
       /* Hit or miss? */
-      if (r2 > 0.f && r2 < hig2) {
-        IACT_STARS(r2, dx, hi, hj, spi, pj, a, H);
+      if (r2 < hig2) {
+        IACT_STARS(r2, dx, hi, pj->h, spi, pj, a, H);
       }
     } /* loop over the parts in cj. */
   }   /* loop over the parts in ci. */
@@ -414,6 +848,9 @@ void DOPAIR1_SUBSET_BRANCH_STARS(struct runner *r, struct cell *restrict ci,
 
   const struct engine *e = r->e;
 
+  /* Anything to do here? */
+  if (cj->hydro.count == 0) return;
+
   /* Get the relative distance between the pairs, wrapping. */
   double shift[3] = {0.0, 0.0, 0.0};
   for (int k = 0; k < 3; k++) {
@@ -423,7 +860,27 @@ void DOPAIR1_SUBSET_BRANCH_STARS(struct runner *r, struct cell *restrict ci,
       shift[k] = -e->s->dim[k];
   }
 
-  DOPAIR1_SUBSET_STARS(r, ci, sparts_i, ind, scount, cj, shift);
+#ifdef SWIFT_USE_NAIVE_INTERACTIONS_STARS
+  DOPAIR1_SUBSET_STARS_NAIVE(r, ci, sparts_i, ind, scount, cj, shift);
+#else
+  /* Get the sorting index. */
+  int sid = 0;
+  for (int k = 0; k < 3; k++)
+    sid = 3 * sid + ((cj->loc[k] - ci->loc[k] + shift[k] < 0)
+                         ? 0
+                         : (cj->loc[k] - ci->loc[k] + shift[k] > 0) ? 2 : 1);
+
+  /* Switch the cells around? */
+  const int flipped = runner_flip[sid];
+  sid = sortlistID[sid];
+
+  /* Has the cell cj been sorted? */
+  if (!(cj->hydro.sorted & (1 << sid)) ||
+      cj->hydro.dx_max_sort_old > space_maxreldx * cj->dmin)
+    error("Interacting unsorted cells.");
+
+  DOPAIR1_SUBSET_STARS(r, ci, sparts_i, ind, scount, cj, sid, flipped, shift);
+#endif
 }
 
 void DOSUB_SUBSET_STARS(struct runner *r, struct cell *ci, struct spart *sparts,
@@ -1075,18 +1532,18 @@ void DOPAIR1_BRANCH_STARS(struct runner *r, struct cell *ci, struct cell *cj) {
 
   const int ci_active = cell_is_active_stars(ci, e);
   const int cj_active = cell_is_active_stars(cj, e);
-#ifdef UPDATE_STARS
-  const int ci_local = ci->nodeID == engine_rank;
-  const int cj_local = cj->nodeID == engine_rank;
+#if (FUNCTION_TASK_LOOP == TASK_LOOP_DENSITY)
+  const int do_ci_stars = ci->nodeID == e->nodeID;
+  const int do_cj_stars = cj->nodeID == e->nodeID;
 #else
   /* here we are updating the hydro -> switch ci, cj */
-  const int ci_local = cj->nodeID == engine_rank;
-  const int cj_local = ci->nodeID == engine_rank;
+  const int do_ci_stars = cj->nodeID == e->nodeID;
+  const int do_cj_stars = ci->nodeID == e->nodeID;
 #endif
-  const int do_ci =
-      (ci->stars.count != 0 && cj->hydro.count != 0 && ci_active && ci_local);
-  const int do_cj =
-      (cj->stars.count != 0 && ci->hydro.count != 0 && cj_active && cj_local);
+  const int do_ci = (ci->stars.count != 0 && cj->hydro.count != 0 &&
+                     ci_active && do_ci_stars);
+  const int do_cj = (cj->stars.count != 0 && ci->hydro.count != 0 &&
+                     cj_active && do_cj_stars);
 
   /* Anything to do here? */
   if (!do_ci && !do_cj) return;
@@ -1130,7 +1587,11 @@ void DOPAIR1_BRANCH_STARS(struct runner *r, struct cell *ci, struct cell *cj) {
   }
 #endif /* SWIFT_DEBUG_CHECKS */
 
-  DOPAIR1_STARS(r, ci, cj, 1);
+#ifdef SWIFT_USE_NAIVE_INTERACTIONS_STARS
+  DOPAIR1_STARS_NAIVE(r, ci, cj, 1);
+#else
+  DO_SYM_PAIR1_STARS(r, ci, cj, sid, shift);
+#endif
 }
 
 /**
@@ -1367,18 +1828,18 @@ void DOSUB_PAIR1_STARS(struct runner *r, struct cell *ci, struct cell *cj,
   /* Otherwise, compute the pair directly. */
   else {
 
-#ifdef UPDATE_STARS
-    const int ci_local = ci->nodeID == engine_rank;
-    const int cj_local = cj->nodeID == engine_rank;
+#if (FUNCTION_TASK_LOOP == TASK_LOOP_DENSITY)
+    const int do_ci_stars = ci->nodeID == e->nodeID;
+    const int do_cj_stars = cj->nodeID == e->nodeID;
 #else
     /* here we are updating the hydro -> switch ci, cj */
-    const int ci_local = cj->nodeID == engine_rank;
-    const int cj_local = ci->nodeID == engine_rank;
+    const int do_ci_stars = cj->nodeID == e->nodeID;
+    const int do_cj_stars = ci->nodeID == e->nodeID;
 #endif
     const int do_ci = ci->stars.count != 0 && cj->hydro.count != 0 &&
-                      cell_is_active_stars(ci, e) && ci_local;
+                      cell_is_active_stars(ci, e) && do_ci_stars;
     const int do_cj = cj->stars.count != 0 && ci->hydro.count != 0 &&
-                      cell_is_active_stars(cj, e) && cj_local;
+                      cell_is_active_stars(cj, e) && do_cj_stars;
 
     if (do_ci) {
 
diff --git a/src/scheduler.c b/src/scheduler.c
index 6187949c2e12e00a6caf51813aeaa46959dd0374..496d15ab302e6f0ea1280594ec16c433b117eb32 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -467,7 +467,7 @@ void scheduler_write_dependencies(struct scheduler *s, int verbose) {
 
   if (s->nodeID == 0) {
     /* Create file */
-    char *filename = "dependency_graph.csv";
+    const char *filename = "dependency_graph.csv";
     FILE *f = fopen(filename, "w");
     if (f == NULL) error("Error opening dependency graph file.");
 
diff --git a/src/space.c b/src/space.c
index b98c1f86c3f1e01fa2553e6dc80a8bd857fb9fc5..bba6001ed63440747601f8abebd9f7a7076e847c 100644
--- a/src/space.c
+++ b/src/space.c
@@ -83,7 +83,7 @@ int space_extra_gparts = space_extra_gparts_default;
 
 /*! Expected maximal number of strays received at a rebuild */
 int space_expected_max_nr_strays = space_expected_max_nr_strays_default;
-#ifdef SWIFT_DEBUG_CHECKS
+#if defined(SWIFT_DEBUG_CHECKS) || defined(SWIFT_CELL_GRAPH)
 int last_cell_id;
 #endif
 
@@ -256,7 +256,7 @@ void space_rebuild_recycle_mapper(void *map_data, int num_elements,
     c->grav.ti_end_max = -1;
     c->stars.ti_end_min = -1;
     c->stars.ti_end_max = -1;
-#ifdef SWIFT_DEBUG_CHECKS
+#if defined(SWIFT_DEBUG_CHECKS) || defined(SWIFT_CELL_GRAPH)
     c->cellID = 0;
 #endif
     if (s->with_self_gravity)
@@ -569,7 +569,7 @@ void space_regrid(struct space *s, int verbose) {
           c->mpi.grav.send = NULL;
 #endif  // WITH_MPI
           if (s->with_self_gravity) c->grav.multipole = &s->multipoles_top[cid];
-#ifdef SWIFT_DEBUG_CHECKS
+#if defined(SWIFT_DEBUG_CHECKS) || defined(SWIFT_CELL_GRAPH)
           c->cellID = -last_cell_id;
           last_cell_id++;
 #endif
@@ -1551,7 +1551,7 @@ void space_rebuild(struct space *s, int repartitioned, int verbose) {
     c->grav.ti_old_multipole = ti_current;
     c->stars.ti_old_part = ti_current;
 
-#ifdef SWIFT_DEBUG_CHECKS
+#if defined(SWIFT_DEBUG_CHECKS) || defined(SWIFT_CELL_GRAPH)
     c->cellID = -last_cell_id;
     last_cell_id++;
 #endif
@@ -2744,7 +2744,7 @@ void space_split_recursive(struct space *s, struct cell *c,
 #ifdef WITH_MPI
       cp->mpi.tag = -1;
 #endif  // WITH_MPI
-#ifdef SWIFT_DEBUG_CHECKS
+#if defined(SWIFT_DEBUG_CHECKS) || defined(SWIFT_CELL_GRAPH)
       cp->cellID = last_cell_id++;
 #endif
     }
@@ -3977,7 +3977,7 @@ void space_init(struct space *s, struct swift_params *params,
   /* Init the space lock. */
   if (lock_init(&s->lock) != 0) error("Failed to create space spin-lock.");
 
-#ifdef SWIFT_DEBUG_CHECKS
+#if defined(SWIFT_DEBUG_CHECKS) || defined(SWIFT_CELL_GRAPH)
   last_cell_id = 1;
 #endif
 
@@ -4553,3 +4553,85 @@ void space_struct_restore(struct space *s, FILE *stream) {
                     s->nr_sparts, 1);
 #endif
 }
+
+#define root_cell_id 0
+/**
+ * @brief write a single cell in a csv file.
+ *
+ * @param s The #space.
+ * @param f The file to use (already open).
+ * @param c The current #cell.
+ */
+void space_write_cell(const struct space *s, FILE *f, const struct cell *c) {
+#ifdef SWIFT_CELL_GRAPH
+
+  if (c == NULL) return;
+
+  /* Get parent ID */
+  int parent = root_cell_id;
+  if (c->parent != NULL) parent = c->parent->cellID;
+
+  /* Get super ID */
+  char superID[100] = "";
+  if (c->super != NULL) sprintf(superID, "%i", c->super->cellID);
+
+  /* Get hydro super ID */
+  char hydro_superID[100] = "";
+  if (c->hydro.super != NULL)
+    sprintf(hydro_superID, "%i", c->hydro.super->cellID);
+
+  /* Write line for current cell */
+  fprintf(f, "%i,%i,%i,", c->cellID, parent, c->nodeID);
+  fprintf(f, "%i,%i,%i,%s,%s,%g,%g,%g,%g,%g,%g, ", c->hydro.count,
+          c->stars.count, c->grav.count, superID, hydro_superID, c->loc[0],
+          c->loc[1], c->loc[2], c->width[0], c->width[1], c->width[2]);
+  fprintf(f, "%g, %g\n", c->hydro.h_max, c->stars.h_max);
+
+  /* Write children */
+  for (int i = 0; i < 8; i++) {
+    space_write_cell(s, f, c->progeny[i]);
+  }
+#endif
+}
+
+/**
+ * @brief Write a csv file containing the cell hierarchy
+ *
+ * @param s The #space.
+ */
+void space_write_cell_hierarchy(const struct space *s) {
+
+#ifdef SWIFT_CELL_GRAPH
+
+  /* Open file */
+  char filename[200];
+  sprintf(filename, "cell_hierarchy_%04i.csv", engine_rank);
+  FILE *f = fopen(filename, "w");
+  if (f == NULL) error("Error opening task level file.");
+
+  const int root_id = root_cell_id;
+  /* Write header */
+  if (engine_rank == 0) {
+    fprintf(f, "name,parent,mpi_rank,");
+    fprintf(f,
+            "hydro_count,stars_count,gpart_count,super,hydro_super,"
+            "loc1,loc2,loc3,width1,width2,width3,");
+    fprintf(f, "hydro_h_max,stars_h_max\n");
+
+    /* Write root data */
+    fprintf(f, "%i, ,-1,", root_id);
+    fprintf(f, "%li,%li,%li, , , , , , , , , ", s->nr_parts, s->nr_sparts,
+            s->nr_gparts);
+    fprintf(f, ",\n");
+  }
+
+  /* Write all the top level cells (and their children) */
+  for (int i = 0; i < s->nr_cells; i++) {
+    struct cell *c = &s->cells_top[i];
+    if (c->nodeID == engine_rank) space_write_cell(s, f, c);
+  }
+
+  /* Cleanup */
+  fclose(f);
+#endif
+}
diff --git a/src/space.h b/src/space.h
index fe47a2b8b995e5872e79e755b5b8075a409795b8..924c3efaf81f88cb82a8c23707d42883832aa071 100644
--- a/src/space.h
+++ b/src/space.h
@@ -331,5 +331,6 @@ void space_free_cells(struct space *s);
 
 void space_struct_dump(struct space *s, FILE *stream);
 void space_struct_restore(struct space *s, FILE *stream);
+void space_write_cell_hierarchy(const struct space *s);
 
 #endif /* SWIFT_SPACE_H */
diff --git a/src/star_formation/EAGLE/star_formation.h b/src/star_formation/EAGLE/star_formation.h
index b72bb38babaca51b3875147d04c46f2de95de1a7..43cc820189a117669aba30c36323a2aab840eadf 100644
--- a/src/star_formation/EAGLE/star_formation.h
+++ b/src/star_formation/EAGLE/star_formation.h
@@ -24,7 +24,9 @@
 #include "cooling.h"
 #include "cosmology.h"
 #include "engine.h"
+#include "entropy_floor.h"
 #include "equation_of_state.h"
+#include "exp10.h"
 #include "hydro.h"
 #include "parser.h"
 #include "part.h"
@@ -187,23 +189,6 @@ INLINE static double EOS_pressure(const double n_H,
          pow(n_H * starform->EOS_density_c_inv, starform->EOS_polytropic_index);
 }
 
-/**
- * @brief Compute the temperarue on the polytropic equation of state for a given
- * Hydrogen number density.
- *
- * Schaye & Dalla Vecchia 2008, eq. 13 rewritten for temperature
- *
- * @param n_H The Hydrogen number density in internal units.
- * @param starform The properties of the star formation model.
- * @return The temperature on the equation of state in internal units.
- */
-INLINE static double EOS_temperature(const double n_H,
-                                     const struct star_formation* starform) {
-
-  return starform->EOS_temperature_c *
-         pow(n_H, starform->EOS_polytropic_index - 1.);
-}
-
 /**
  * @brief Calculate if the gas has the potential of becoming
  * a star.
@@ -216,7 +201,7 @@ INLINE static double EOS_temperature(const double n_H,
  * @param hydro_props The properties of the hydro scheme.
  * @param us The internal system of units.
  * @param cooling The cooling data struct.
- *
+ * @param entropy_floor The entropy floor assumed in this run.
  */
 INLINE static int star_formation_is_star_forming(
     const struct part* restrict p, const struct xpart* restrict xp,
@@ -224,7 +209,8 @@ INLINE static int star_formation_is_star_forming(
     const struct cosmology* cosmo,
     const struct hydro_props* restrict hydro_props,
     const struct unit_system* restrict us,
-    const struct cooling_function_data* restrict cooling) {
+    const struct cooling_function_data* restrict cooling,
+    const struct entropy_floor_properties* restrict entropy_floor) {
 
   /* Minimal density (converted from critical density) for star formation */
   const double rho_crit_times_min_over_den =
@@ -261,7 +247,8 @@ INLINE static int star_formation_is_star_forming(
                                                      us, cosmo, cooling, p, xp);
 
   /* Temperature on the equation of state */
-  const double temperature_eos = EOS_temperature(n_H, starform);
+  const double temperature_eos =
+      entropy_floor_temperature(p, cosmo, entropy_floor);
 
   /* Check the Scahye & Dalla Vecchia 2012 EOS-based temperature critrion */
   return (temperature <
diff --git a/src/star_formation/GEAR/star_formation.h b/src/star_formation/GEAR/star_formation.h
index 420cecb6f6cdfa6be8d0803064122fa539131d0c..05bb584a5330002e610df9c1866c672f5ae1977f 100644
--- a/src/star_formation/GEAR/star_formation.h
+++ b/src/star_formation/GEAR/star_formation.h
@@ -21,6 +21,7 @@
 
 /* Local includes */
 #include "cosmology.h"
+#include "entropy_floor.h"
 #include "error.h"
 #include "hydro_properties.h"
 #include "parser.h"
@@ -50,7 +51,8 @@ INLINE static int star_formation_is_star_forming(
     const struct cosmology* cosmo,
     const struct hydro_props* restrict hydro_props,
     const struct unit_system* restrict us,
-    const struct cooling_function_data* restrict cooling) {
+    const struct cooling_function_data* restrict cooling,
+    const struct entropy_floor_properties* restrict entropy_floor) {
 
   return 0;
 }
diff --git a/src/star_formation/none/star_formation.h b/src/star_formation/none/star_formation.h
index 7dbe5b20cc401c0284036f3c973c9b65fcec8d2e..25c0bcee6a8d2aa2f4be5479556eebc50027aa72 100644
--- a/src/star_formation/none/star_formation.h
+++ b/src/star_formation/none/star_formation.h
@@ -21,6 +21,7 @@
 
 /* Local includes */
 #include "cosmology.h"
+#include "entropy_floor.h"
 #include "error.h"
 #include "hydro_properties.h"
 #include "parser.h"
@@ -53,7 +54,8 @@ INLINE static int star_formation_is_star_forming(
     const struct cosmology* cosmo,
     const struct hydro_props* restrict hydro_props,
     const struct unit_system* restrict us,
-    const struct cooling_function_data* restrict cooling) {
+    const struct cooling_function_data* restrict cooling,
+    const struct entropy_floor_properties* restrict entropy_floor) {
 
   return 0;
 }
diff --git a/src/stars/Default/stars.h b/src/stars/Default/stars.h
index 586a87f75600a08acfd84b0f7ecc57fc4573281f..1ff4936284c4d8913417c502db69a372fc83bc06 100644
--- a/src/stars/Default/stars.h
+++ b/src/stars/Default/stars.h
@@ -72,18 +72,7 @@ __attribute__((always_inline)) INLINE static void stars_init_spart(
  * @param dt_drift The drift time-step for positions.
  */
 __attribute__((always_inline)) INLINE static void stars_predict_extra(
-    struct spart* restrict sp, float dt_drift) {
-
-  // MATTHIEU
-  /* const float h_inv = 1.f / sp->h; */
-
-  /* /\* Predict smoothing length *\/ */
-  /* const float w1 = sp->feedback.h_dt * h_inv * dt_drift; */
-  /* if (fabsf(w1) < 0.2f) */
-  /*   sp->h *= approx_expf(w1); /\* 4th order expansion of exp(w) *\/ */
-  /* else */
-  /*   sp->h *= expf(w1); */
-}
+    struct spart* restrict sp, float dt_drift) {}
 
 /**
  * @brief Sets the values to be predicted in the drifts to their values at a
diff --git a/src/tools.c b/src/tools.c
index 43ac0177daef171850ea325f9fa23770fb82ae13..a29408449600ad4b46bd73ba17e20adefdbcb613 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -442,6 +442,9 @@ void pairs_all_stars_density(struct runner *r, struct cell *ci,
 
       struct part *pj = &cj->hydro.parts[j];
 
+      /* Early abort? */
+      if (part_is_inhibited(pj, e)) continue;
+
       /* Pairwise distance */
       r2 = 0.0f;
       for (int k = 0; k < 3; k++) {
@@ -472,6 +475,9 @@ void pairs_all_stars_density(struct runner *r, struct cell *ci,
 
       struct part *pi = &ci->hydro.parts[i];
 
+      /* Early abort? */
+      if (part_is_inhibited(pi, e)) continue;
+
       /* Pairwise distance */
       r2 = 0.0f;
       for (int k = 0; k < 3; k++) {
@@ -660,6 +666,9 @@ void self_all_stars_density(struct runner *r, struct cell *ci) {
       pj = &ci->hydro.parts[j];
       hj = pj->h;
 
+      /* Early abort? */
+      if (part_is_inhibited(pj, e)) continue;
+
       /* Pairwise distance */
       r2 = 0.0f;
       for (int k = 0; k < 3; k++) {
@@ -668,7 +677,7 @@ void self_all_stars_density(struct runner *r, struct cell *ci) {
       }
 
       /* Hit or miss? */
-      if (r2 > 0.f && r2 < hig2) {
+      if (r2 < hig2) {
         /* Interact */
         runner_iact_nonsym_stars_density(r2, dxi, hi, hj, spi, pj, a, H);
       }
diff --git a/tests/test27cellsStars.c b/tests/test27cellsStars.c
index e7e1b64b1cc99d8a51cf380fde1560bdd634ae20..e97aee278e4b34d7cb1904826aba7a5ff3ed5d67 100644
--- a/tests/test27cellsStars.c
+++ b/tests/test27cellsStars.c
@@ -70,6 +70,7 @@ struct cell *make_cell(size_t n, size_t n_stars, double *offset, double size,
   const size_t count = n * n * n;
   const size_t scount = n_stars * n_stars * n_stars;
   float h_max = 0.f;
+  float stars_h_max = 0.f;
   struct cell *cell = (struct cell *)malloc(sizeof(struct cell));
   bzero(cell, sizeof(struct cell));
 
@@ -143,7 +144,7 @@ struct cell *make_cell(size_t n, size_t n_stars, double *offset, double size,
           spart->h = size * h * random_uniform(1.f, h_pert) / (float)n_stars;
         else
           spart->h = size * h / (float)n_stars;
-        h_max = fmaxf(h_max, spart->h);
+        stars_h_max = fmaxf(stars_h_max, spart->h);
         spart->id = ++(*spartId);
 
         spart->time_bin = 1;
@@ -161,6 +162,7 @@ struct cell *make_cell(size_t n, size_t n_stars, double *offset, double size,
   cell->split = 0;
   cell->hydro.h_max = h_max;
   cell->hydro.count = count;
+  cell->stars.h_max = stars_h_max;
   cell->stars.count = scount;
   cell->hydro.dx_max_part = 0.;
   cell->hydro.dx_max_sort = 0.;
diff --git a/tools/data/cell_hierarchy.html b/tools/data/cell_hierarchy.html
new file mode 100644
index 0000000000000000000000000000000000000000..6c9bcdb995be7970948cf9b9544ae0a59d41caf0
--- /dev/null
+++ b/tools/data/cell_hierarchy.html
@@ -0,0 +1,387 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    
+    <title>Cell Hierarchy</title>
+
+    <style>
+
+      div.tooltip {
+	  position: absolute;
+	  text-align: left;
+	  width: 180px;
+	  height: 80px;
+	  padding: 2px;
+	  font: 12px sans-serif;
+	  background: lightsteelblue;
+	  border: 0px;
+	  border-radius: 8px;
+	  pointer-events: none;
+      }	
+      .node {
+	  cursor: pointer;
+      }
+      
+      .node circle {
+	  fill: #fff;
+	  stroke: steelblue;
+	  stroke-width: 3px;
+      }
+
+      .node text {
+	  font: 12px sans-serif;
+      }
+
+      .link {
+	  fill: none;
+	  stroke: #ccc;
+	  stroke-width: 2px;
+      }
+
+    </style>
+
+  </head>
+
+  <div class="ui-widget">
+    <input id="search">
+    <button type="button" onclick="searchNode()">Search</button>
+    <progress value="0" max="100" id="progress">0</progress>
+  </div>
+  <body>
+
+<!-- load the d3.js library -->	
+<script src="https://d3js.org/d3.v5.min.js"></script>
+	
+<script>
+  // ************** Generate the tree diagram	 *****************
+  var margin = {top: 20, right: 60, bottom: 20, left: 60},
+      width = 1800 - margin.right - margin.left,
+      height = 900 - margin.top - margin.bottom;
+  
+  var i = 0,
+      duration = 750,
+      root;
+
+  var tree = d3.tree()
+      .size([10*width, height]);
+
+  // append the svg object to the body of the page
+  // appends a 'group' element to 'svg'
+  // moves the 'group' element to the top left margin
+  var svg = d3.select("body").append("svg")
+      .attr("width", width + margin.right + margin.left)
+      .attr("height", height + margin.top + margin.bottom)
+      .call(d3.zoom().on("zoom", function () {
+	  svg.attr("transform", d3.event.transform)
+      }))
+      .append("g")
+      .attr("transform", "translate("
+            + margin.left + "," + margin.top + ")")
+  
+  // load the external data
+  d3.csv("cell_hierarchy.csv").then(function(data) {
+
+      // *********** Convert flat data into a nice tree ***************
+      // create a name: node map
+      var dataMap = data.reduce(function(map, node) {
+	  map[node.name] = node;
+	  return map;
+      }, {});
+	
+      // create the tree array
+      var treeData = [];
+      data.forEach(function(node) {
+	  // add to parent
+	  var parent = dataMap[node.parent];
+	  if (parent) {
+	      // create child array if it doesn't exist
+	      (parent.children || (parent.children = []))
+	      // add node to child array
+		  .push(node);
+	  } else {
+	      // parent is null or missing
+	      treeData.push(node);
+	  }
+      });
+
+      root = d3.hierarchy(treeData[0], function(d) { return d.children; });
+
+      root.x0 = width / 2;
+      root.y0 = 0;
+
+      // Collapse after the second level
+      root.children.forEach(collapse);
+      update(root);
+      
+      var N = root.children.length
+      var size = 1.
+      if (N > 64)
+	  size = 15 * N / 1664
+      tree = tree.size([size * width, height]);
+      update(root)
+  
+  });
+
+  d3.select(self.frameElement).style("height", "500px");
+
+  function update(source) {
+
+      // Assigns the x and y position for the nodes
+      var treeData = tree(root);
+
+      // Compute the new tree layout.
+      var nodes = treeData.descendants(),
+	  links = treeData.descendants().slice(1);
+
+      // Normalize for fixed-depth.
+      nodes.forEach(function(d){ d.y = d.depth * 100});
+
+      // ****************** Nodes section ***************************
+
+      // Update the nodes...
+      var node = svg.selectAll('g.node')
+	  .data(nodes, function(d) {return d.id || (d.id = ++i); });
+
+      // Enter any new modes at the parent's previous position.
+      var nodeEnter = node.enter().append('g')
+	  .attr('class', 'node')
+	  .attr("transform", function(d) {
+              return "translate(" + source.x0 + "," + source.y0 + ")";
+	  })
+	  .on('click', click)
+
+      // add tool tip for ps -eo pid,ppid,pcpu,size,comm,ruser,s
+	  .on("mouseover", function(d) {
+	      var n = d.data
+              div.transition()
+		  .duration(200)
+		  .style("opacity", .9);
+              div .html(
+		  "ID: " + n.name + "<br/>" +
+		      "MPI rank:" + n.mpi_rank + "<br/>" + 
+		      "Part: " + n.hydro_count + "<br/>" + 
+		      "Spart: " + n.stars_count + "<br/>" +
+		      "Super: " + n.super + "<br/>" +
+		      "Super Hydro: " + n.hydro_super + "<br/>" +
+		      "Loc: " + n.loc1 + ", " + n.loc2 + ", " + n.loc3 + "<br/>" +
+		      "Width: " + n.width1 + ", " + n.width2 + ", " + n.width3 + "<br/>" +
+		      "Hydro h_max: " + n.hydro_h_max + "<br/>" +
+		      "Stars h_max: " + n.stars_h_max + "<br/>"
+              )
+		  .style("left", (d3.event.pageX) + "px")
+		  .style("top", (d3.event.pageY - 28) + "px")
+	      // change here to change the tool tip box size
+		  .style("height", 180 + "px");
+	  })
+	  .on("mouseout", function(d) {
+              div.transition()
+		  .duration(500)
+		  .style("opacity", 0);
+	  });
+
+      // Add Circle for the nodes
+      nodeEnter.append('circle')
+	  .attr('class', 'node')
+	  .attr('r', 1e-6)
+	  .style("fill", function(d) {
+              return d._children ? "lightsteelblue" : "#fff";
+	  });
+
+      // Add labels for the nodes
+      nodeEnter.append('text')
+	  .attr("dy", ".35em")
+	  .attr("x",  -55)
+	  .attr("text-anchor", "start")
+	  .attr("transform", "rotate(90)")
+	  .text(function(d) { return d.data.name; });
+      
+      // add the tool tip
+      var div = d3.select("body").append("div")
+	  .attr("class", "tooltip")
+	  .style("opacity", 0);
+
+      // UPDATE
+      var nodeUpdate = nodeEnter.merge(node);
+
+      // Transition to the proper position for the node
+      nodeUpdate.transition()
+	  .duration(duration)
+	  .attr("transform", function(d) { 
+              return "translate(" + d.x + "," + d.y + ")";
+	  });
+
+      // Update the node attributes and style
+      nodeUpdate.select('circle.node')
+	  .attr('r', 10)
+	  .style("fill", function(d) {
+              return d._children ? "lightsteelblue" : "#fff";
+	  })
+	  .attr('cursor', 'pointer');
+
+
+      // Remove any exiting nodes
+      var nodeExit = node.exit().transition()
+	  .duration(duration)
+	  .attr("transform", function(d) {
+              return "translate(" + source.x + "," + source.y + ")";
+	  })
+	  .remove();
+
+      // On exit reduce the node circles size to 0
+      nodeExit.select('circle')
+	  .attr('r', 1e-6);
+
+      // On exit reduce the opacity of text labels
+      nodeExit.select('text')
+	  .style('fill-opacity', 1e-6);
+
+      // ****************** links section ***************************
+
+      // Update the links...
+      var link = svg.selectAll('path.link')
+	  .data(links, function(d) { return d.id; });
+
+      // Enter any new links at the parent's previous position.
+      var linkEnter = link.enter().insert('path', "g")
+	  .attr("class", "link")
+	  .attr('d', function(d){
+              var o = {x: source.x0, y: source.y0}
+              return diagonal(o, o)
+	  });
+      
+      // UPDATE
+      var linkUpdate = linkEnter.merge(link);
+      
+      // Transition back to the parent element position
+      linkUpdate.transition()
+	  .duration(duration)
+	  .attr('d', function(d){ return diagonal(d, d.parent) });
+      
+      // Remove any exiting links
+      var linkExit = link.exit().transition()
+	  .duration(duration)
+	  .attr('d', function(d) {
+              var o = {x: source.x, y: source.y}
+              return diagonal(o, o)
+	  })
+	  .remove();
+
+      // Store the old positions for transition.
+      nodes.forEach(function(d){
+	  d.x0 = d.x;
+	  d.y0 = d.y;
+      });
+
+      // Creates a curved (diagonal) path from parent to the child nodes
+      function diagonal(s, d) {
+
+	  path = `M ${s.x} ${s.y}
+            C ${(s.x + d.x) / 2} ${s.y},
+              ${(s.x + d.x) / 2} ${d.y},
+              ${d.x} ${d.y}`
+
+	  return path
+      }
+
+      // Toggle children on click.
+      function click(d) {
+	  if (d.children) {
+              d._children = d.children;
+              d.children = null;
+	  } else {
+              d.children = d._children;
+              d._children = null;
+	  }
+	  update(d);
+      }
+  }
+
+
+  // Collapse the node and all it's children
+  function collapse(d) {
+      if(d.children) {
+	  d._children = d.children
+	  d._children.forEach(collapse)
+	  d.children = null
+      }
+  }
+
+  // open the node and all it's parent
+  function openNode(d) {
+      if (d._children) {
+ 	  d.children = d._children
+	  d._children = null
+      }
+      if (d.parent)
+	  openNode(d.parent)
+  }
+
+  var selectedVal;
+  
+  function searchSubNode(node) {
+      if (node.data.name == selectedVal) {
+	  openNode(node)
+	  update(root)
+	  return true
+      }
+
+      var found = false
+      if (node.children) {
+	  var N = node.children.length
+	  for(var i = 0; i < N; i++) {
+	      found = searchSubNode(node.children[i])
+	      if (found) {
+		  break
+	      }
+	  }
+      }
+
+      if (found)
+	  return found
+
+      if (node._children) {
+	  var N = node._children.length
+	  for(var i = 0; i < N; i++) {
+	      found = searchSubNode(node._children[i])
+	      if (found) {
+		  break
+	      }
+	  }
+
+      }
+
+      return found
+      
+  }
+
+  function searchNode() {
+      //find the node
+      selectedVal = document.getElementById('search').value;
+      var progress = document.getElementById("progress");
+      progress.innerHTML = "0%"
+      progress.value = 0
+      
+      var N = root.children.length
+      for(var i = 0; i < N; i++) {
+	  var found = searchSubNode(root.children[i], selectedVal)
+
+	  if (found) {
+	      progress.innerHTML = "100%"
+	      progress.value = 100
+	      return
+	  }
+	  else {
+	      progress.innerHTML = 100 * i / (N - 1.) + "%"
+	      progress.value = 100 * i / (N - 1.)
+	  }
+      }
+
+      console.log("Not found")
+  }
+
+
+</script>
+	
+  </body>
+</html>
diff --git a/tools/make_cell_hierarchy.sh b/tools/make_cell_hierarchy.sh
new file mode 100644
index 0000000000000000000000000000000000000000..87fbe4c97f4aadcbb9be5867a62e8acb56415820
--- /dev/null
+++ b/tools/make_cell_hierarchy.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+output=cell_hierarchy.html
+
+# merge all mpi ranks together
+csv_output=cell_hierarchy.csv
+if [ -f $csv_output ]
+then
+   rm $csv_output
+fi
+
+for filename in ./cell_hierarchy_*.csv;
+do
+    cat $filename >> cell_hierarchy.csv
+done
+
+# copy HTML page to the repository
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+cp $DIR/data/cell_hierarchy.html $output
+
+echo $output has been generated