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VISSL

       LOGICAL FUNCTION  VISSL (EX,WY,X,Y,I)
 C$    (Straight Line)
 C$    Determine  whether   the   point  (EX,WY)   lies   on   the
 C$    straight-line    segment     between    (X(I),Y(I))     and
 C$    (X(I-1),Y(I-1)).
 C$    (09-APR-82)