fill area between two curves? fill_between?

I want to fill the area between two curves with a color (incl. alpha channel, I use the agg backend). fill() seems to fill only the area between the x-axis and one curve - at least I found no way for filling only the area between two graphs. Is there a way for doing so at all? Or do I have to use another graphic library for this kind of fill_between()?

-Dirk

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