diff --git a/examples/cosmo_box_gravity_only_3d/Config.sh b/examples/cosmo_box_gravity_only_3d/Config.sh
new file mode 100755
index 0000000000000000000000000000000000000000..9e1c854fa77481daa25b30903ae4c2a1cf42d877
--- /dev/null
+++ b/examples/cosmo_box_gravity_only_3d/Config.sh
@@ -0,0 +1,54 @@
+#!/bin/bash # this line only there to enable syntax highlighting in this file
+
+##################################################
+# Enable/Disable compile-time options as needed #
+# examples/cosmo_box_gravity_only_3d/Config.sh #
+##################################################
+
+
+#--------------------------------------- Gravity treatment
+SELFGRAVITY # gravitational intraction between simulation particles/cells
+HIERARCHICAL_GRAVITY # use hierarchical splitting of the time integration of the gravity
+CELL_CENTER_GRAVITY # uses geometric centers to calculate gravity of cells, only possible with HIERARCHICAL_GRAVITY
+ALLOW_DIRECT_SUMMATION # Performed direct summation instead of tree-based gravity if number of active particles < DIRECT_SUMMATION_THRESHOLD (= 3000 unless specified differently here)
+DIRECT_SUMMATION_THRESHOLD=500 # Overrides maximum number of active particles for which direct summation is performed instead of tree based calculation
+
+#--------------------------------------- Gravity softening
+NSOFTTYPES=2 # Number of different softening values to which particle types can be mapped.
+MULTIPLE_NODE_SOFTENING # If a tree node is to be used which is softened, this is done with the softenings of its different mass components
+INDIVIDUAL_GRAVITY_SOFTENING=32 # bitmask with particle types where the softenig type should be chosen with that of parttype 1 as a reference type
+ADAPTIVE_HYDRO_SOFTENING # Adaptive softening of gas cells depending on their size
+
+#--------------------------------------- TreePM Options
+PMGRID=256 # Enables particle mesh; number of cells used for grid in each dimension
+RCUT=5.0 # This can be used to override the maximum radius in which the short-range tree-force is evaluated (in case the TreePM algorithm is used). The default value is 4.5, given in mesh-cells.
+
+#--------------------------------------- Time integration options
+TREE_BASED_TIMESTEPS # non-local timestep criterion (take 'signal speed' into account)
+
+#--------------------------------------- Single/Double Precision
+DOUBLEPRECISION=1 # Mode of double precision: not defined: single; 1: full double precision 2: mixed, 3: mixed, fewer single precisions; unless short of memory, use 1.
+DOUBLEPRECISION_FFTW # FFTW calculation in double precision
+OUTPUT_COORDINATES_IN_DOUBLEPRECISION # will always output coordinates in double precision
+NGB_TREE_DOUBLEPRECISION # if this is enabled, double precision is used for the neighbor node extension
+
+#--------------------------------------- On the fly FOF groupfinder
+FOF # enable FoF output
+FOF_PRIMARY_LINK_TYPES=2 # 2^type for the primary dark matter type
+FOF_SECONDARY_LINK_TYPES=1+16+32 # 2^type for the types linked to nearest primaries
+
+#--------------------------------------- Subfind
+SUBFIND # enables substructure finder
+SAVE_HSML_IN_SNAPSHOT # stores hsml, density, and velocity dispersion values in the snapshot files
+SUBFIND_CALC_MORE # calculates also the velocity dispersion in the local density estimate (this is automatically enabled by several other options, e.g. SAVE_HSML_IN_SNAPSHOT)
+SUBFIND_EXTENDED_PROPERTIES # adds calculation of further quantities related to angular momentum in different components
+
+#-------------------------------------------- Things for special behaviour
+PROCESS_TIMES_OF_OUTPUTLIST # goes through times of output list prior to starting the simulaiton to ensure that outputs are written as close to the desired time as possible (as opposed to at next possible time if this flag is not active)
+
+#--------------------------------------- Output/Input options
+REDUCE_FLUSH # only flush output to log-files in predefined intervals
+HAVE_HDF5 # needed when HDF5 I/O support is desired (recommended)
+
+#--------------------------------------- Testing and Debugging options
+DEBUG # enables core-dumps
diff --git a/examples/cosmo_box_gravity_only_3d/L50n32/ics b/examples/cosmo_box_gravity_only_3d/L50n32/ics
new file mode 100644
index 0000000000000000000000000000000000000000..66dd0c6b3b0a617058bc6f692287d35f55075709
Binary files /dev/null and b/examples/cosmo_box_gravity_only_3d/L50n32/ics differ
diff --git a/examples/cosmo_box_gravity_only_3d/L50n32/inputspec_ics.txt b/examples/cosmo_box_gravity_only_3d/L50n32/inputspec_ics.txt
new file mode 100644
index 0000000000000000000000000000000000000000..20fef05848ee2ae60d4fce12d63c384ccab6d599
--- /dev/null
+++ b/examples/cosmo_box_gravity_only_3d/L50n32/inputspec_ics.txt
@@ -0,0 +1,561 @@
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diff --git a/examples/cosmo_box_gravity_only_3d/Masses_L50n32_z0.txt b/examples/cosmo_box_gravity_only_3d/Masses_L50n32_z0.txt
new file mode 100644
index 0000000000000000000000000000000000000000..53b34536715e793d85284f27997ecb30eac944ba
--- /dev/null
+++ b/examples/cosmo_box_gravity_only_3d/Masses_L50n32_z0.txt
@@ -0,0 +1,62 @@
+4.222264453125000000e+14
+1.860935937500000000e+14
+9.680791992187500000e+13
+9.419149414062500000e+13
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diff --git a/examples/cosmo_box_gravity_only_3d/Masses_L50n32_z1.txt b/examples/cosmo_box_gravity_only_3d/Masses_L50n32_z1.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b92550d8cdef0f2df01f6e9cb11dcb2eb2de6bd3
--- /dev/null
+++ b/examples/cosmo_box_gravity_only_3d/Masses_L50n32_z1.txt
@@ -0,0 +1,25 @@
+1.040031054687500000e+14
+6.868129394531250000e+13
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diff --git a/examples/cosmo_box_gravity_only_3d/check.py b/examples/cosmo_box_gravity_only_3d/check.py
new file mode 100644
index 0000000000000000000000000000000000000000..224b49c1ca6399c7217f4ce0f438935c0339f5c6
--- /dev/null
+++ b/examples/cosmo_box_gravity_only_3d/check.py
@@ -0,0 +1,106 @@
+""" @package ./examples/cosmo_box_gravity_only_3d/check.py
+Code that checks results of gravity only structure formation simulation
+
+created by Rainer Weinberger, last modified 25.02.2019
+"""
+
+""" load libraries """
+import sys ## load sys; needed for exit codes
+import numpy as np ## load numpy
+import h5py ## load h5py; needed to read snapshots
+import matplotlib.pyplot as plt ## plot stuff
+
+simulation_directory = str(sys.argv[1])
+print("examples/cosmo_box_gravity_only_3d/check.py: checking simulation output in directory " + simulation_directory)
+
+FloatType = np.float64 # double precision: np.float64, for single use np.float32
+
+Boxsize = 50 ##Mpc/h
+HubbleParam = 0.6774
+UnitMass = 1.0e10
+Volume = Boxsize * Boxsize * Boxsize / HubbleParam / HubbleParam / HubbleParam
+
+Redshifts = [1, 0]
+status = 0
+
+CompareAgainstReferenceRun = True ## comparison for small L50m32 box; deactivate this when comparing against self-created ICs
+createFigures = True
+
+for i_file, z in enumerate(Redshifts):
+ """ try to read in snapshot """
+ directory = simulation_directory+"/output/"
+ filename = "fof_subhalo_tab_%03d.hdf5" % (i_file)
+ try:
+ data = h5py.File(directory+filename, "r")
+ except:
+ print("could not open "+directory+filename)
+ sys.exit(1)
+
+ """ get simulation data """
+ ## simulation data
+ GrpPos = np.array(data["Group"]["GroupPos"], dtype=FloatType) / HubbleParam / 1000.
+ GrpR200c = np.array(data["Group"]["Group_R_Crit200"], dtype=FloatType) / HubbleParam / 1000.
+ M200c = np.array(data["Group"]["GroupMass"], dtype=FloatType) * UnitMass
+ M200c = np.sort(M200c)[::-1]
+ CumMassFunction = np.cumsum(np.ones(M200c.shape) ) / Volume
+
+ if CompareAgainstReferenceRun:
+ ## comparison to reference run (sorted list of M200)
+ M200c_ref = np.loadtxt("./examples/cosmo_box_gravity_only_3d/Masses_L50n32_z%.1d.txt"% z)
+
+ minLen = np.min([len(M200c), len(M200c_ref)])
+ i_select = np.arange(minLen)
+
+ delta = (M200c[i_select]-M200c_ref[i_select]) / M200c_ref[i_select]
+
+ ## empirically based tolerances
+ tolerance_average = 0.01
+ tolerance_std = 0.05
+ if np.abs(np.average(delta)) > tolerance_average or np.abs(np.std(delta)) > tolerance_std:
+ status = 1
+ print("ERROR: z=%g difference in halo masses exceeding limits!" % z)
+ print("relative mass error (=delta)")
+ print(delta)
+ print("average delta (tolerance: %g)" % tolerance_average)
+ print(np.average(delta))
+ print("stddev delta (tolerance: %g)" % tolerance_std)
+ print(np.std(delta))
+
+ """ optional figure """
+ if createFigures:
+ filename = "snap_%03d.hdf5" % (i_file)
+ try:
+ data = h5py.File(directory+filename, "r")
+ except:
+ print("could not open "+directory+filename)
+ sys.exit(1)
+ pos = np.array(data["PartType1"]["Coordinates"], dtype=FloatType) / HubbleParam / 1000.
+
+ fig = plt.figure(figsize=(6.9,6.9))
+ ax = plt.axes([0.1,0.1,0.87,0.87])
+
+ if(pos.shape[0] > 32**3):
+ i_select = np.random.uniform(low=0.0, high=pos.shape[0], size=32**3).astype(np.int)
+ else:
+ i_select = np.arange(pos.shape[0])
+ ax.scatter(pos[i_select, 0], pos[i_select, 1], marker='.', s=0.05, alpha=0.5, rasterized=True)
+ for i in np.arange(GrpR200c.shape[0]):
+ ax.add_artist(plt.Circle((GrpPos[i,0], GrpPos[i,1]), GrpR200c[i], color='k', fill=False))
+
+ ax.set_xlim([0,Boxsize/HubbleParam])
+ ax.set_ylim([0,Boxsize/HubbleParam])
+ ax.set_xlabel('[Mpc]')
+ ax.set_ylabel('[Mpc]')
+
+ bx = plt.axes([0.70,0.74,0.26,0.22])
+ bx.plot(M200c, CumMassFunction)
+ bx.set_xscale('log')
+ bx.set_yscale('log')
+ bx.set_xlim([9e12,5e14])
+ bx.set_ylim([9e-7,2e-4])
+ bx.set_xlabel(r"M$_{200,c}$ [M$_\odot$]")
+ bx.set_ylabel(r"$n$(>M) [Mpc$^{-3}$]")
+ fig.savefig(simulation_directory+'/largeScaleStructure_z%.1d.pdf'%z, dpi=300)
+
+## if everything is ok: 0 else: 1
+sys.exit(status)
diff --git a/examples/cosmo_box_gravity_only_3d/create.py b/examples/cosmo_box_gravity_only_3d/create.py
new file mode 100644
index 0000000000000000000000000000000000000000..dfd3c2c0190c1aba9504be6256702b1df716487d
--- /dev/null
+++ b/examples/cosmo_box_gravity_only_3d/create.py
@@ -0,0 +1,82 @@
+""" @package examples/cosmo_box_gravity_only_3d/create.py
+Code that creates 3d cosmologiacl box ICs;
+some ICs provided, but can be created also at startup if
+ic_creation is set to 'music' or 'ngenic'.
+
+created by Rainer Weinberger, last modified 25.02.2019
+"""
+
+
+""" load libraries """
+import sys # needed for exit codes
+import numpy as np # scientific computing package
+import h5py # hdf5 format
+import os # operating system interface
+from subprocess import call # execute bash commands
+
+## create new ics with 'music' or 'ngenic' or just 'copy' existing ones to the run directory
+ic_creation='copy'
+
+
+""" input """
+simulation_directory = str(sys.argv[1])
+print("examples/cosmo_box_gravity_only_3d/create.py " + simulation_directory)
+
+
+""" initial conditions: either copy or create with code """
+if ic_creation == 'copy':
+ ## copy and use provided initial conditions
+ call(['cp', './examples/cosmo_box_gravity_only_3d/L50n32/ics', simulation_directory+'/ics'])
+
+elif ic_creation == 'music':
+ ## create new initial conditions with the MUSIC code
+ status = call(['hg', 'clone', 'https://bitbucket.org/ohahn/music', simulation_directory+'/music'])
+ if status != 0:
+ print('CREATE: ERROR: hg clone failed!')
+ sys.exit(status)
+ cwd = os.getcwd()
+ os.chdir(simulation_directory+'/music/')
+ status = call(['make'])
+ if status != 0:
+ print('CREATE: ERROR: make failed!')
+ sys.exit(status)
+ status = call(['./MUSIC',cwd+'/examples/cosmo_box_gravity_only_3d/param_music.txt'])
+ if status != 0:
+ print('CREATE: ERROR: execution failed!')
+ sys.exit(status)
+ os.chdir(cwd)
+
+elif ic_creation == 'ngenic':
+ ## create new initial conditions with the N-GenIC code
+ status = call(['git', 'clone', 'https://gitlab.mpcdf.mpg.de/ext-c2c74fbfcdff/ngenic.git', simulation_directory+'/ngenic'])
+ if status != 0:
+ print('CREATE: ERROR: git clone failed!')
+ sys.exit(status)
+ cwd = os.getcwd()
+ os.chdir(simulation_directory+'/ngenic/')
+ status = call(['make'])
+ if status != 0:
+ print('CREATE: ERROR: make failed!')
+ sys.exit(status)
+ status = call(['mpiexec','-np','1','./N-GenIC',cwd+'/examples/cosmo_box_gravity_only_3d/param_ngenic.txt'])
+ if status != 0:
+ print('CREATE: ERROR: execution failed!')
+ sys.exit(status)
+ os.chdir(cwd)
+else:
+ print("CREATE: ERROR: no valid option for ic creation! choose 'copy', 'music' or 'ngenic'")
+ exit(1)
+
+
+""" set output times z=1,0"""
+outputTimes = np.array([0.5, 1], dtype=np.float64)
+ones = np.ones(outputTimes.shape, dtype=np.int)
+
+
+""" write output list file """
+data = np.array([outputTimes, ones]).T
+np.savetxt(simulation_directory+"/output_list.txt",data, fmt="%g %1.f" )
+
+
+""" normal exit """
+sys.exit(0)
diff --git a/examples/cosmo_box_gravity_only_3d/param.txt b/examples/cosmo_box_gravity_only_3d/param.txt
new file mode 100644
index 0000000000000000000000000000000000000000..389a23f3cf6acb84f900c44fb9ead3471f012529
--- /dev/null
+++ b/examples/cosmo_box_gravity_only_3d/param.txt
@@ -0,0 +1,107 @@
+%---- Relevant files
+InitCondFile run/examples/cosmo_box_gravity_only_3d/ics
+OutputDir run/examples/cosmo_box_gravity_only_3d/output
+SnapshotFileBase snap
+OutputListFilename run/examples/cosmo_box_gravity_only_3d/output_list.txt
+
+%---- File formats
+ICFormat 1
+SnapFormat 3
+
+%---- CPU-time limits
+TimeLimitCPU 93000
+CpuTimeBetRestartFile 12000
+FlushCpuTimeDiff 120
+
+ResubmitOn 0
+ResubmitCommand my-scriptfile
+
+%----- Memory alloction
+MaxMemSize 2500
+
+%---- Caracteristics of run
+TimeBegin 0.0078125 % Begin of the simulation z=127
+TimeMax 1.0 % End of the simulation z=0
+
+%---- Basic code options that set the type of simulation
+ComovingIntegrationOn 1
+PeriodicBoundariesOn 1
+CoolingOn 0
+StarformationOn 0
+
+%---- Cosmological parameters (Planck 2016 cosmology)
+Omega0 0.3089
+OmegaLambda 0.6911
+OmegaBaryon 0.0 %0.0486
+HubbleParam 0.6774
+BoxSize 50000.0
+
+%---- Output frequency and output parameters
+OutputListOn 1
+TimeBetSnapshot 0.0
+TimeOfFirstSnapshot 0.0
+TimeBetStatistics 0.01
+NumFilesPerSnapshot 1
+NumFilesWrittenInParallel 1
+
+%---- Accuracy of time integration
+TypeOfTimestepCriterion 0
+ErrTolIntAccuracy 0.012
+CourantFac 0.3
+MaxSizeTimestep 0.005
+MinSizeTimestep 2.0e-9
+
+
+%---- Treatment of empty space and temperature limits
+InitGasTemp 244.8095
+MinGasTemp 5.0
+MinimumDensityOnStartUp 1.0e-20
+LimitUBelowThisDensity 0.0
+LimitUBelowCertainDensityToThisValue 0.0
+MinEgySpec 0.0
+
+%---- Tree algorithm, force accuracy, domain update frequency
+TypeOfOpeningCriterion 1
+ErrTolTheta 0.7
+ErrTolForceAcc 0.0025
+MultipleDomains 4
+TopNodeFactor 2.5
+ActivePartFracForNewDomainDecomp 0.01
+
+%---- Initial density estimate
+DesNumNgb 64
+MaxNumNgbDeviation 4
+
+%---- System of units
+UnitLength_in_cm 3.085678e21 % 1.0 kpc
+UnitMass_in_g 1.989e43 % 1.0e10 solar masses
+UnitVelocity_in_cm_per_s 1e5 % 1 km/sec
+GravityConstantInternal 0
+
+%---- Gravitational softening lengths
+SofteningComovingType0 40.0
+SofteningComovingType1 40.0
+
+SofteningMaxPhysType0 20.0
+SofteningMaxPhysType1 20.0
+
+GasSoftFactor 2.5
+
+SofteningTypeOfPartType0 0
+SofteningTypeOfPartType1 1
+SofteningTypeOfPartType2 1
+SofteningTypeOfPartType3 1
+SofteningTypeOfPartType4 1
+SofteningTypeOfPartType5 1
+
+
+MinimumComovingHydroSoftening 1.0
+AdaptiveHydroSofteningSpacing 1.2
+
+%----- Mesh regularization options
+CellShapingSpeed 0.5
+CellShapingFactor 1.0
+
+%----- Subfind
+ErrTolThetaSubfind 0.7
+DesLinkNgb 20
diff --git a/examples/cosmo_box_gravity_only_3d/param_music.txt b/examples/cosmo_box_gravity_only_3d/param_music.txt
new file mode 100644
index 0000000000000000000000000000000000000000..481013bb95caa91237961e89d2882fa2ad06f238
--- /dev/null
+++ b/examples/cosmo_box_gravity_only_3d/param_music.txt
@@ -0,0 +1,46 @@
+[setup]
+boxlength = 50
+zstart = 127
+levelmin = 5
+levelmin_TF = 5
+levelmax = 5
+padding = 8
+overlap = 4
+ref_center = 0.5, 0.5, 0.5
+ref_extent = 0.4, 0.4, 0.4
+align_top = no
+baryons = no
+use_2LPT = no
+use_LLA = no
+periodic_TF = yes
+[cosmology]
+Omega_m = 0.3089
+Omega_L = 0.6911
+w0 = -1.0
+wa = 0.0
+Omega_b = 0.0486
+H0 = 67.74
+sigma_8 = 0.831
+nspec = 0.9645
+transfer = eisenstein
+[random]
+seed[7] = 12345
+seed[8] = 23456
+seed[9] = 34567
+seed[10] = 45678
+seed[11] = 56789
+seed[12] = 67890
+[output]
+#Gadget-2 (type=1: high-res particles, type=5: rest)
+format = gadget2
+filename = ../ics
+gadget_coarsetype = 2
+gadget_usekpc = yes
+[poisson]
+fft_fine = yes
+accuracy = 1e-5
+pre_smooth = 3
+post_smooth = 3
+smoother = gs
+laplace_order = 6
+grad_order = 6
\ No newline at end of file
diff --git a/examples/cosmo_box_gravity_only_3d/param_ngenic.txt b/examples/cosmo_box_gravity_only_3d/param_ngenic.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b95eba39dd2a9c2b737959632de21ea2959b5d4e
--- /dev/null
+++ b/examples/cosmo_box_gravity_only_3d/param_ngenic.txt
@@ -0,0 +1,82 @@
+
+Nmesh 128 % This is the size of the FFT grid used to
+ % compute the displacement field. One
+ % should have Nmesh >= Nsample.
+
+Nsample 128 % sets the maximum k that the code uses,
+ % i.e. this effectively determines the
+ % Nyquist frequency that the code assumes,
+ % k_Nyquist = 2*PI/Box * Nsample/2
+ % Normally, one chooses Nsample such that
+ % Ntot = Nsample^3, where Ntot is the
+ % total number of particles
+
+
+Box 50000.0 % Periodic box size of simulation
+FileBase ics % Base-filename of output files
+OutputDir ../ % Directory for output
+GlassFile dummy_glass.dat % File with unperturbed glass or
+ % Cartesian grid
+TileFac 4 % Number of times the glass file is
+ % tiled in each dimension (must be
+ % an integer)
+
+
+Omega 0.3089 % Total matter density (at z=0)
+OmegaLambda 0.6911 % Cosmological constant (at z=0)
+OmegaBaryon 0.0 % Baryon density (at z=0)
+HubbleParam 0.6774 % Hubble paramater (may be used for power spec parameterization)
+Redshift 127 % Starting redshift
+Sigma8 0.831 % power spectrum normalization
+
+
+SphereMode 1 % if "1" only modes with |k| < k_Nyquist are
+ % used (i.e. a sphere in k-space), otherwise modes with
+ % |k_x|,|k_y|,|k_z| < k_Nyquist are used
+ % (i.e. a cube in k-space)
+
+
+WhichSpectrum 1 % "1" selects Eisenstein & Hu spectrum,
+ % "2" selects a tabulated power spectrum in
+ % the file 'FileWithInputSpectrum'
+ % otherwise, Efstathiou parametrization is used
+
+
+FileWithInputSpectrum input_spectrum.txt % filename of tabulated input
+ % spectrum (if used)
+InputSpectrum_UnitLength_in_cm 3.085678e24 % defines length unit of tabulated
+ % input spectrum in cm/h.
+ % Note: This can be chosen different from UnitLength_in_cm
+
+ReNormalizeInputSpectrum 1 % if set to zero, the
+ % tabulated spectrum is
+ % assumed to be normalized
+ % already in its amplitude to
+ % the starting redshift,
+ % otherwise this is recomputed
+ % based on the specified sigma8
+
+
+ShapeGamma 0.21 % only needed for Efstathiou power spectrum
+PrimordialIndex 0.9645 % may be used to tilt the primordial index,
+ % primordial spectrum is k^PrimordialIndex
+
+
+Seed 123456 % seed for IC-generator
+
+
+NumFilesWrittenInParallel 1 % limits the number of files that are
+ % written in parallel when outputting
+
+
+UnitLength_in_cm 3.085678e21 % defines length unit of output (in cm/h)
+UnitMass_in_g 1.989e43 % defines mass unit of output (in g/cm)
+UnitVelocity_in_cm_per_s 1e5 % defines velocity unit of output (in cm/sec)
+
+
+
+
+
+
+
+
diff --git a/test.sh b/test.sh
index 4186b518774acd6658c801003fdb65502b693511..0eec03dc80bea9388bc3d42ff1917ad6d64181df 100644
--- a/test.sh
+++ b/test.sh
@@ -23,6 +23,7 @@ TESTS+="yee_2d "
## available 3d examples
TESTS+="noh_3d "
+TESTS+="cosmo_box_gravity_only_3d "
## loop over all tests
for TEST in $TESTS