[R] Moving averages shading / two colours / polygon

[olo]

I am stuck at the following problem.

I have two moving averages. One is faster than another. After plotting them
I need to shade area between them in green when the faster is above slower
and red where faster is below slower.

Something like this:
http://charts.stocktwits.com/production/original_9205513.png?1345576091

I tried with polygon but I can't do it. Any hints?

Regards
olo



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