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YSTACK-ARRAY

 YSTACK(*)....LOGICAL bar stacking flags.    If YSTACK(K) is .TRUE., the
              histogram bar  heights for  curves L  = 1..K-1  for  which
              HISTGM(L) =  .TRUE.   and YSTACK(L)  =  .TRUE. and  the  X
              values match  will be  summed to  determine an  additional
              increment to the baseline of  bar K, thereby stacking  the
              bar on top of previous  ones.  The default is YSTACK(*)  =
              .FALSE.