diff --git a/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/README b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/README
new file mode 100644
index 0000000000000000000000000000000000000000..8e537fc3e69f50cdf618cd34be105b97f4d601ac
--- /dev/null
+++ b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/README
@@ -0,0 +1,9 @@
+# Example to test the external NFW + MN external potential implementation.
+# The gas disc is initialized so that the particles are in cicular orbit with that of the NFW + MN potential.
+# The initial thickness of the gaseous disk is arbitrarius, so that it readjust while runnig the simulation.
+# Parameters of the MN disk should be self-explanatory from the parameter file.
+
+tested with the following options:
+
+./configure --with-hydro=gadget2 --with-ext-potential=nfw_mn --disable-hand-vec
+
diff --git a/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/generate_MN.py b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/generate_MN.py
new file mode 100644
index 0000000000000000000000000000000000000000..a231b3a3b63f59e1438047cb383ecb7483f3b705
--- /dev/null
+++ b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/generate_MN.py
@@ -0,0 +1,178 @@
+###############################################################################
+ # This file is part of SWIFT.
+ # Copyright (c) 2019 Alejandro Benitez-Llambay (alejandro.b.llambay@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/>.
+ #
+ ##############################################################################
+
+import numpy as np
+from scipy import special
+import matplotlib.pyplot as plt
+import h5py
+
+G = 4.299e-6
+
+def mcum(r, c):
+ a = np.log(1+c*r)-c*r/(1.0+c*r)
+ b = np.log(1+c)-c/(1.0+c)
+ return a/b
+
+def MN_Vcirc(R, z, Rd=4.0, Md=3e10, Zd=0.4):
+ return np.sqrt(G*Md*R**2/(R**2+(Rd+np.sqrt(z**2+Zd**2))**2)**(3./2.))
+
+def get_vcirc_expo(R, Mgas=3e10, Rd=4.0):
+ sigma0 = Mgas/(2.0*np.pi*Rd**2)
+ sigma = sigma0*np.exp(-R/Rd)
+ y = R/(2.0*Rd)
+ I0 = special.i0(y)
+ K0 = special.k0(y)
+ I1 = special.i1(y)
+ K1 = special.k1(y)
+ return np.sqrt(4.0*np.pi*G*sigma0*Rd*y**2*(I0*K0-I1*K1))
+
+def dP1(x):
+ return x*np.exp(-x)
+
+def dP2(x):
+ return 1.0/np.cosh(x)**2
+
+hlittle = 0.704
+rhoc = 2.775e2 * hlittle**2
+
+#halo mass and concentration
+#-------------------
+m200 = 1.5e12 #Msun
+c = 10.0
+r200 = (m200/(200*rhoc*4./3.*np.pi))**(1./3.)
+#-------------------
+
+#Gaseous disk
+#-----------------
+npart = int(1e5) #This controls the resolution
+md = 7e8
+rd = 0.02*r200
+zd = 0.1*rd
+#-----------------
+
+#MN parameters
+#-----------------
+MN_Md = 3e10 #Msun
+MN_Rd = 4.0 #kpc
+MN_Zd = 0.4 #kpc
+#-----------------
+
+#Outputfile
+#------------------------
+outputfile = 'MN_ICs.hdf5' #Output file for SWIFT
+#------------------------
+
+x = []
+y = []
+z = []
+phi = []
+
+while(len(x) <= npart):
+ n = int(4.5e5)
+ rmin = 0
+ rmax = 8
+
+ zmin = -6
+ zmax = 6
+
+ r0 = rmin+(rmax-rmin)*np.random.rand(n)
+ z0 = zmin+(zmax-zmin)*np.random.rand(n)
+
+ ymin = 0
+ ymax1 = np.max(dP1(r0))
+ ymax2 = np.max(dP2(z0))
+
+ y1 = ymin+(ymax1-ymin)*np.random.rand(n)
+ y2 = ymin+(ymax2-ymin)*np.random.rand(n)
+
+ k, = np.where( (y1 <= dP1(r0)) & (y2 <= dP2(z0) ) )
+
+ phi0 = 2*np.pi*np.random.rand(len(k))
+ phi.extend(phi0)
+ x.extend(r0[k]*np.cos(phi0))
+ y.extend(r0[k]*np.sin(phi0))
+ z.extend(z0[k])
+
+sample = np.random.randint(0,len(x), npart)
+x = np.asarray(x)[:npart]
+y = np.asarray(y)[:npart]
+z = np.asarray(z)[:npart]
+phi = np.asarray(phi)[:npart]
+
+r = np.sqrt(x**2+y**2+z**2)
+
+#Set positions
+pgas = np.ones([npart,3])
+pgas[:,0] = x*rd
+pgas[:,1] = y*rd
+pgas[:,2] = z*zd
+vgas = np.zeros([npart,3])
+rhogas = np.zeros(npart)
+ugas = np.ones(npart)*0
+mgas = np.ones(npart)*md/npart*1e-10
+
+#Set velocities
+Rgas = np.sqrt(pgas[:,0]**2+pgas[:,1]**2)
+ksort = np.argsort(Rgas)
+
+vcirc_gas = get_vcirc_expo(Rgas, Mgas=md, Rd=rd) #Approximate the velocity of the disk (better than spherical)
+vcirc_dm = np.sqrt(G*mcum(Rgas/r200,c)*m200/(Rgas))
+vcirc_MN = MN_Vcirc(Rgas, pgas[:,2], Md=MN_Md, Rd=MN_Rd, Zd=MN_Zd)
+vcirc_tot = np.sqrt(vcirc_dm**2+vcirc_gas**2+vcirc_MN**2)
+
+vgas[:,0] = vcirc_tot*np.sin(phi)
+vgas[:,1] = -vcirc_tot*np.cos(phi)
+
+
+boxsize = 400.0 #Boxsize for SWIFT
+
+for i in range(3):
+ pgas[:,i] += 200
+
+
+with h5py.File(outputfile,'w') as snap:
+ header = snap.create_group('Header')
+
+ particles = snap.create_group('PartType0')
+ particles.create_dataset('Coordinates',data=pgas,dtype=np.float32)
+ particles.create_dataset('Velocities',data=vgas,dtype=np.float32)
+ particles.create_dataset('InternalEnergy',data=ugas,dtype=np.float32)
+ particles.create_dataset('Densities',data=rhogas,dtype=np.float32)
+ particles.create_dataset('Masses',data=mgas,dtype=np.float32)
+ particles.create_dataset('SmoothingLength',data=np.ones(len(mgas)),dtype=np.float32)
+ particles.create_dataset('ParticleIDs',data=np.arange(len(mgas)),dtype='uint')
+
+ header.attrs['NumPart_ThisFile'] = np.array([len(mgas),0,0,0,0,0], dtype='uint')
+ header.attrs['NumPart_Total'] = np.array([len(mgas),0,0,0,0,0], dtype='uint')
+ header.attrs['MassTable'] = np.array([0,0,0,0,0,0], dtype='double')
+ header.attrs['Time'] = 0
+ header.attrs['Redshift'] = 0
+ header.attrs['Flag_Entropy_ICs'] = 0
+ header.attrs['NumFilesPerSnapshot'] = 1
+ header.attrs['NumPart_Total_HighWord'] = np.array([0,0,0,0,0,0], dtype='int')
+ header.attrs['BoxSize'] = boxsize
+
+ snap.close()
+
+
+
+
+
+
+
diff --git a/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/getIC.sh b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/getIC.sh
new file mode 100755
index 0000000000000000000000000000000000000000..7cfd203108fc04aa6a61e340b499e6d66ccc5c03
--- /dev/null
+++ b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/getIC.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+wget http://virgodb.cosma.dur.ac.uk/swift-webstorage/ICs/IsolatedGalaxies/Isolated_NFW_MN.hdf5
diff --git a/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/isolated_galaxy.yml b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/isolated_galaxy.yml
new file mode 100644
index 0000000000000000000000000000000000000000..d2ca7aae80862e1bc1e89e645c6a1bb3adfcba1b
--- /dev/null
+++ b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/isolated_galaxy.yml
@@ -0,0 +1,61 @@
+# Define the system of units to use internally.
+InternalUnitSystem:
+ UnitMass_in_cgs: 1.9891E43 # 10^10 solar masses
+ UnitLength_in_cgs: 3.08567758E21 # 1 kpc
+ UnitVelocity_in_cgs: 1E5 # km/s
+ UnitCurrent_in_cgs: 1 # Amperes
+ UnitTemp_in_cgs: 1 # Kelvin
+
+# Parameters for the self-gravity scheme
+Gravity:
+ eta: 0.025 # Constant dimensionless multiplier for time integration.
+ theta: 0.7 # Opening angle (Multipole acceptance criterion).
+ max_physical_baryon_softening: 0.100 # Physical softening length (in internal units).
+
+# Parameters governing the time integration (Set dt_min and dt_max to the same value for a fixed time-step run.)
+TimeIntegration:
+ time_begin: 0. # The starting time of the simulation (in internal units).
+ time_end: 2. # The end time of the simulation (in internal units).
+ dt_min: 1e-6 # 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: output # Common part of the name of output files
+ time_first: 0. # (Optional) Time of the first output if non-cosmological time-integration (in internal units)
+ delta_time: 0.001 # Time difference between consecutive outputs (in internal units)
+
+# Parameters governing the conserved quantities statistics
+Statistics:
+ delta_time: 1e-2 # Time between statistics output
+ time_first: 0. # (Optional) Time of the first stats output if non-cosmological time-integration (in internal units)
+
+Scheduler:
+ max_top_level_cells: 16
+
+# Parameters related to the initial conditions
+InitialConditions:
+ file_name: Isolated_NFW_MN.hdf5 # The file to read
+ periodic: 0 # Are we running with periodic ICs?
+
+# Parameters for the hydrodynamics scheme
+SPH:
+ minimal_temperature: 1000. # Minimum allowed gas temperature
+ 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: 0.2 # Courant-Friedrich-Levy condition for time integration.
+ h_min_ratio: 0.1 # Minimal smoothing in units of softening.
+ h_max: 100.
+
+
+#NFWPotential:
+NFW_MNPotential:
+ useabspos: 0 # 0 -> positions based on centre, 1 -> absolute positions
+ position: [0.,0.,0.] # Location of centre of isothermal potential with respect to centre of the box (if 0) otherwise absolute (if 1) (internal units)
+ timestep_mult: 0.01 # Dimensionless pre-factor for the time-step condition, basically determines the fraction of the orbital time we use to do the time integration
+ epsilon: 0.01 # Softening size (internal units)
+ concentration: 10.0 # concentration of the Halo
+ M_200: 150.0 # M200 of the galaxy disk
+ critical_density: 1.37E-8 # Critical density of the Universe in internal units
+ Mdisk: 3.0 # Disk mass (internal units)
+ Rdisk: 4.0 # Disk size (internal units)
+ Zdisk: 0.4704911 # Disk scale-height (internal units)
diff --git a/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/run.sh b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/run.sh
new file mode 100755
index 0000000000000000000000000000000000000000..492eddc7b7fcf2e0a192a7408bdf888f1ef5a1a6
--- /dev/null
+++ b/examples/IsolatedGalaxy/IsolatedGalaxy_NFW_MN/run.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if [ ! -e Isolated_NFW_MN.hdf5 ]
+then
+ echo "Fetching initial conditions for the isolated galaxy example..."
+ ./getIC.sh
+fi
+
+../../swift -g -G -s --threads=16 isolated_galaxy.yml