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PMKR2

       SUBROUTINE  PMKR2 (DXARAY,INCX,DYARAY,INCY,N)
 C$    (Polymarker Relative 2-D)
 C$    Beginning at the current point,  draw markers at each of  N
 C$    points  in   turn.   (DXARAY(*),DYARAY(*),0)   define   the
 C$    relative displacements from the preceding point.  INCX  and
 C$    INCY are  the  displacements  between successive  X  and  Y
 C$    values in the arrays.  These  will normally be both 1.   If
 C$    an increment INCX or INCY is negative, the starting  vertex
 C$    is taken as (1-N)*INC + 1  instead of 1, so that the  array
 C$    is stepped through  in reverse order.   The marker used  is
 C$    the one currently selected.
 C$    (02-APR-82)