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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