Hi, The projection, slice, velocity and overplot particles routines: They read the DM particles or gas ? Looking at the density legend, it looks like this is baryon density field. Is there a provision to plot projection and slice for DM ? Also, I get this error when overplotting particles... yt INFO 2010-03-22 12:17:44,051 Created plot collection with default plot-center = [0.5, 0.5, 0.5] yt INFO 2010-03-22 12:17:44,144 Getting the binary hierarchy yt INFO 2010-03-22 12:17:44,153 Finished with binary hierarchy reading yt INFO 2010-03-22 12:17:46,108 Added slice of Density at x = 0.5 with 'center' = [0.5, 0.5, 0.5] Traceback (most recent call last): File "slice.py", line 42, in <module> p.modify["nparticles"](0.005) File "/autohome/u118/agarwa23/yt-x86_64/src/yt-1.6/yt/raven/PlotTypes.py", line 52, in __getitem__ raise KeyError(item) KeyError: 'nparticles' Shankar