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does facealpha work?

From: Francesco Potortì
Subject: does facealpha work?
Date: Fri, 25 Jul 2014 10:42:49 +0200

I have tried fill() and 'FaceAlpha" property, but cannot obtain the
results I want.  By changing facelpha i can change the colour, which
becomes paler, but not transparent, as the filled areas below cannot be
seen.  I use the gnuplot backend.

Is there anything obvious that I should know?  Do I need to provide an
example or is this a known problem?

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