Are you sure your DensityProfile.vtk file is correct? It seems the file should contain totally 3375000 data points, but you just list 10 points. (Maybe you omit other data points for clarity?) Check /RASPA/RASPA2/examples/Visualization/FullCell/Density/MFI/hexane/RASPA/simulation.input for a sample input file. By the way, iRASPA can import the DensityProfile.vtk file generated by RASPA (with a newest version) to visualize the density plot, but I find it lacks some functions such as displaying the colorbar. Perhaps you can try iRASPA to see if it can generate the correct results.