arrowx, arrowy
(PLFLT *,input) Pointers to a pair of arrays containing the x and y points
which make up the arrow. The arrow is plotted by joining these
points to form a polygon. The scaling assumes that the x and y
points in the arrow lie in the range
-0.5 <= x,y <= 0.5.
npts
(PLINT,input) Number of points in the arrays
arrowx and
arrowy.
fill
(PLBOOL,input) If fill is true then the
arrow is closed, if fill
is false then the arrow is open.
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