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PVITS

       SUBROUTINE  PVITS (Z1,ZE,Z2, MX,MY, NX,NY,  S, PL2)
 C$    (Triangular Sequence)
 C$    Generate a hidden-line view in triangular coordinates.  The
 C$    arguments are:
 C$
 C$    (MX,MY)........Actual declared dimensions of ZE(*,*).
 C$    ZE(NX,NY)......Array of  function values.   Only the  lower
 C$                   triangle  of  the  square  cross-section  of
 C$                   dimension (NX,NX) is used.
 C$    (Z1,Z2)........Span of Z values.
 C$    S.............. = 1.0, plot positive; = -1.0, plot negative
 C$    PL2............2-D pen movement subroutine, perhaps PL2CA
 C$    (09-APR-82)