Hi yt folks, 

I ran into a problem with PhasePlot that's also apparent in the docs. See the last couple of plots here: 
http://yt-project.org/docs/dev-3.0/analyzing/units/units_and_plotting.html
the color bar doesn't re-scale with set_unit changes currently. I couldn't easily reverse engineer what is done to get this right in e.g. slice plot (but, as a work-around, I just defined a new field with the correct units).

Also, does PhasePlot have set_x/ylim functionality that I'm not finding? 

Thanks!
Sam