A coworker pointed out this plot to me yesterday, and while it's not a huge problem in the grand scheme of things, the issue has kept bugging me.
On one hand, it does a good job of illustrating the variation of temperature and density throughout the atmosphere. On the other hand, what the heck is going on with the two ordinate axes? The mixture of linear and log scales is okay, but tricky with the horizontal grid lines. Trying to have a log-scale ticking system between three orders of magnitude, however, just makes my head hurt.