I'm using yt 2.6 (well, the most up-to-date version of yt 2.x), and am attempting to manually set the limits on a 2D phase plot.  Unfortunately, I can't find anything in the docs, and the one IPython notebook solution linked to is defunct.  So, if I want to manually set the x and y limits on a plot generated using PhasePlot - i.e., with the command: 

phase = PhasePlot(ad, "Baryon_Overdensity", "Temperature", "CellMassMsun", weight_field=None, fractional=True)

What is the best way to do this?

Thanks!

--Brian