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PMKA3

       SUBROUTINE  PMKA3 (XARRAY,INCX,YARRAY,INCY,ZARRAY,INCZ,N)
 C$    (Polymarker Absolute 3-D)
 C$    Beginning at the current point, draw markers at each of the
 C$    N points stored in (XARRAY(*),YARRAY(*),ZARRAY(*)) in turn,
 C$    ending at the N-th point which will become the new  current
 C$    position.  INCX,  INCY,  and  INCZ  are  the  displacements
 C$    between successive X, Y, and Z values in the arrays.  These
 C$    will normally  be all  1.   The marker  used will  be  that
 C$    currently selected.  If an increment INCX, INCY, or INCZ is
 C$    negative, the starting  vertex is  taken as  (1-N)*INC +  1
 C$    instead of  1, so  that  the array  is stepped  through  in
 C$    reverse order.
 C$    (02-APR-82)