The PLplot Plotting Library: Programmer's Reference Manual  

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plfill
: Draw filled polygon
Fills the polygon defined by the
n
points
(x
[i],
y
[i]) using the pattern defined by
plpsty
or plpat
. The routine will automatically close the
polygon between the last and first vertices. If multiple closed
polygons are passed in x
and y
then plfill
will
fill in between them.

Redacted form: plfill(x,y)
This function is used in examples 12,13,15,16,21,24,25.