Hi all, I'm trying to use FixedResolutionBuffer to generate 2d projections following the example in the docs (http://yt-project.org/doc/analyzing/generating_processed_data.html) from yt.mods import * pf = load("DD0000/test_disk_0000") projden = pf.h.proj(0,'Density',data_source=pf.h.all_data(),center=[0.5,0.5,0.5]) frb = FixedResolutionBuffer(projden,(0,0,1,1),(512,512)) print frb['Density'] ------> print(frb['Density']) yt : [INFO ] 2011-09-02 00:03:10,273 Making a fixed resolution buffer of 512 by 512 [[ nan nan nan ..., nan nan nan] [ nan nan nan ..., nan nan nan] [ nan nan nan ..., nan nan nan] ..., [ nan nan nan ..., nan nan nan] [ nan nan nan ..., nan nan nan] [ nan nan nan ..., nan nan nan]] Is there a problem with how I'm creating the buffer? I'm pretty sure the way this is done in the docs on the page I linked is incorrect, since I get an error when I do when I try to say sl = pf.h.proj(0,0.5) Thanks for your help, Nathan