[yt-users] loading halo off disk problem

Hi Stephen, I was trying your two examples shown on "Loading Haloes Off Disk" in the documentation, I can do to both: haloes[0].center_of_mass() to find the center of mass coordinate xyz of the 0th halo, but when I tried to get the particle positions by doing haloes[0]["partilcle_position_x"] I succeeded with the first method while the data is still in memory, but fail in the second method when it is loaded off disk, can you verify this? It'll save a lot of time if I have the particle positions without having to run the profiler every time. error pasted at: http://paste.enzotools.org/show/NyLEwvGzl2RGBOcAcfKH From G.S.