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PMKR3

       SUBROUTINE  PMKR3 (DXARAY,INCX,DYARAY,INCY,DZARAY,INCZ,N)
 C$    (Polymarker Relative 3-D)
 C$    Beginning at the current point,  draw markers at each of  N
 C$    points in turn.  (DXARAY(*),DYARAY(*),DZARAY(*)) define the
 C$    relative displacements  from  the preceding  point.   INCX,
 C$    INCY, and INCZ are the displacements between successive  X,
 C$    Y, and Z values in the arrays.  These will normally be  all
 C$    1.  If an increment  INCX, INCY, or  INCZ is negative,  the
 C$    starting vertex is taken as (1-N)*INC + 1 instead of 1,  so
 C$    that the array  is stepped through  in reverse order.   The
 C$    marker used is the one currently selected.
 C$    (02-APR-82)