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% operand stack configuration in order to use psDrawFilled:
% psFillPoly
% XPoint[0].y
% XPoint[0].x
% n
% ...
% XPoint[n].y
% XPoint[n].x
% graphics-context dictionary
% this draws a polygon by connecting all the points and fills the
% region with foreground color
/psFillPoly
{ gsave
newpath
yVal moveto
1 sub {
yVal lineto
} repeat
closepath
begin installGC fill end %% fills with foreground color
grestore }
def
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