Please see the screenshot at
Although the visible difference is minor, I get slightly shifted
legend positions on screen
(and saving as png) and in pdf file. This required me to make manual
axes vertical distance to position the legend) to look good on both
screen and in the pdf.
You can also see my ultra-fine precision legend positioning on these lines:
f06leg = f06.legend((l1, l2), ("Air", "Dew Point"), loc='lower
center', ncol=2, columnspacing=1.0,\
bbox_to_anchor = (0.243, 0.785))
Using qt4agg and xpdf as pdfdistiller on rev8757.