[yt-users] Analysis of projected quantities

Hi all, I'd like to do some analysis on projected quantities (or column densities) and quantities derived from those, like ratios etc. How can I use the output of some projections to derive some other quantities from it? How can I use those as inputs for BinnedProfileXd()-stuff, to compute profiles and phase plots? This would be extremely useful for analyzing my disk galaxy simulations. Thanks for your help. Best. Harald