Do not generate gas in the small cosmo volume ICs in the default example script.

examples/SmallCosmoVolume/small_cosmo_volume.yml

@@ -34,15 +34,7 @@ Gravity:
   comoving_softening:     0.0889     # 1/25th of the mean inter-particle separation: 88.9 kpc
   max_physical_softening: 0.0889     # 1/25th of the mean inter-particle separation: 88.9 kpc
   mesh_side_length:       64
-
-# Parameters of the hydro scheme
-SPH:
-  resolution_eta:      1.2348   # "48 Ngb" with the cubic spline kernel
-  CFL_condition:       0.1
-  initial_temperature: 7075.    # (1 + z_ini)^2 * 2.72K
-  minimal_temperature: 100.
-
-
+  
 # Parameters governing the snapshots
 Snapshots:
   basename:            snap
@@ -63,5 +55,3 @@ InitialConditions:
   file_name:  small_cosmo_volume.hdf5
   cleanup_h_factors:           1    
   cleanup_velocity_factors:    1  
-  generate_gas_in_ics: 1            # Generate gas particles from the DM-only ICs
-  cleanup_smoothing_lengths: 1      # Since we generate gas, make use of the (expensive) cleaning-up procedure.