New issue 668: Explain how to set custom tick marks for PlotWindow plots. https://bitbucket.org/yt_analysis/yt/issue/668/explain-how-to-set-custom-tick-marks-for Nathan Goldbaum: See e.g. http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2013-September/004079.html