Hi yt user, Previously, I asked basic question how I can access raw data using yt. At that time, I confirm that the following script print the x, y, z,vx, vy, vz, and mass for all finest cells in the spherical region ================= from yt.mods import * pf = load("../DD%04d/DD%04d" % (snapshot,snapshot)) center = pf.h.find_max("Density")[1] sp = pf.h.sphere(center, (rmax,'pc')) for icell in range(0,sp["CellMassMsun"].size): print sp["x"][icell], sp["y"][icell], sp["z"][icell] print sp["x-velocity"][icell], sp["y-velocity"][icell], sp["z-velocity"][icell] print sp["CellMassMsun"][icell] ================ However, is there any way to access the coarse raw data? For example, the highest resolution of my simulation is say N_amr=10. But, I would like to access the data only up to N_amr=5 (from top grid to N_amr=5 grid). In this case, the grid information N_amr=6 to 10 is represented by its parent grid data. Is it possible? If so, how can I access these coarse data? Thank you in advance, Junhwan