Is it possible to set a vertical gradient as a marker face in matplotlib? E.g. something like this:

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                    [Related question](http://stackoverflow.com/q/10958835/3714930) – fhdrsdg Apr 01 '15 at 09:17
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                    [elderly related question](http://stackoverflow.com/questions/2318288/how-to-use-custom-marker-with-plot/2320099#2320099) – cphlewis Apr 01 '15 at 17:31