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PLTIL

       SUBROUTINE  PLTIL (X1,Y1, Z1, X2,Y2, Z2, PL2)
 C$    (Interrupted Line)
 C$    Draw a  line  from (X1,Y1)  to  (X2,Y2) showing  only  that
 C$    portion where Z is  positive, this region being  determined
 C$    by linear interpolation from Z1 and Z2.  PL2 is the 2-D pen
 C$    movement subroutine, perhaps PL2CA.
 C$    (09-APR-82)