Plot pkg - Multiple Y axes?

[bernhard.voigt at gmail.com]

You can try matplotlib. It allows multiple plots in one window. To get
the correct rendering of the axis layout needs probably some handwork,
but it should be possible. Two axis are not a problem at all. Got
through the examples and take a look at the wiki cookbook.
All is available at http://matplotlib.sourceforge.net/

Cheers! Bernhard