[yt-dev] Projections of FITS cubes

Hi all, I think this question is primarily for John ZuHone, but please feel free to jump in. I'm currently looking at the FITS frontend for my scipy talk. I just made a projection of the M33 HI data cube we have on the data hub. The image is here: http://i.imgur.com/kcw98g8.png I know that we decided to not try to jam WCS axes into the PlotWindow code, instead reserving that for PlotWindowWCS. I agree with that. However, I'm confused about the units of the z-axis. Presumably, the units of the actual observation are km/s. Did we ever investigate making the units of the z-axis km/s? Is that not possible at the moment due to a restriction that all three axes must have spatial units? Thanks for your advice, Nathan