Added: 2024-Nov-26 (Kishore G)

Apparently it is important to some users to be able to read grid and dim from HDF5 simulations without relying on the presence of grid.h5. var.h5 in this directory is a 'fake' snapshot containing only the grid information (I took a snapshot from an actual simulation and removed the f-array from the HDF5 file to reduce its size).

Important: do not add grid.h5 to this directory.