Hello,

I have encountered a weird plotting issue recently using a recent mpl
clone. See the linked pdfs for better demonstration of the issue:

http://atmos.uwyo.edu/~gsever/data/vocals_RF04_NU05_newmpl.pdf
http://atmos.uwyo.edu/~gsever/data/vocals_RF04_NU05_oldmpl.pdf


newmpl file is created using the latest master branch (cloned and setup
today)
oldmpl is created using mpl v1.1.0 (
https://github.com/downloads/matplotlib/matplotlib/matplotlib-1.1.0.tar.gz)

Scroll down to page 4 in each file and you will see the wrong
plotted behavior of alwp_lcl (black line) variable on newmpl file comparing
to the correct version that is shown on oldmpl.

I was trying to figure out a way to correct this and I raised y-axis max to
2400 and then the line looks fine. However I have other data that show
similar wrong behaviors, so I decided to try earlier mpl versions since I
know that those plots were looking correct earlier (at least a few months
back). Trying v1.1.x branch gave me the same results. Note that these data
contain "nans". Are nan handling changed in recent mpl code or the way the
data is plotted out of margins? I can't reproduce this with synthetic data.

Any ideas as to what could be going wrong here?

Thanks.

-- 
Gökhan
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