[yt-users] getting all the data in a subgrid

Hi all, As far as I understand, a: ------------------------------------ region = pf.h.region(...) density = region["Density"] ------------------------------------ will return the density field without considering cells that have subcells. How can I access ALL the data stored in the hdf5 file? I have tried to use ------------------------------------ grid = pf.h.grids[i] rhogrid = grid.get_data("Density") ------------------------------------ but I would like to get a 1D array. Thanks for you help, JC