Dear Andrew Myers and yt users, Q1. Given a HDF5 data that is dumped by **PLUTO**, how do I check whether this data is in chombo format or not? In my humble opinion: Run the following script. If the string 'chombo' is shown on screen, then this HDF5 data is in chombo format. Am I right? ------------------------------------------------ import yt ds=yt.load("data.0000.hdf5") print (ds['HydroMethod']) ------------------------------------------------ Q2. If the above question is positive, why do I always get white noise in slice plot after execution the following script? ------------------------------------------------ import yt ds = yt.load("data.0001.hdf5") yt.SlicePlot(ds, 'z', 'density', center='c').save() ------------------------------------------------ thanks a lot.