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PL2TP

       SUBROUTINE  PL2TP (U,V,W,VISBLE)
 C$    (2-D Triangular 3-Coordinate Pen Movement)
 C$    Move  to  the  point  (U,V,W)  in  triangular  coordinates,
 C$    drawing a visible line if VISBLE = .TRUE..  The coordinates
 C$    (U,V,W) will be  renormalized internally  so that  U+V+W=1,
 C$    but are not themselves modified.
 C$    (09-APR-82)