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NCINIT-NCTERM-NCSTEP

 NCINIT,
 NCTERM,
 NCSTEP.......Initial,  terminal, and  increment  values for  the  frame
              column index in a multi-frame  plot.  These values are not
              altered when RESET =   .TRUE., because  their values   are
              needed across multiple input data groups, each of which is
              displayed in one  frame of the  multi-frame plot.    Thus,
              these values must be reset to 1 in the last frame group if
              you wish to revert to the standard single frame plotting.

              The page is divided into frames like this:

                              ---top---
                  11    12    13    14    ....    1M
                  21    22    23    24    ....    2M
                  31    32    33    34    ....    3M
                  ..................................
                  N1    N2    N3    N4    ....    NM
                             ---bottom---

              Either NCINIT or   NCTERM should normally  be 1,  and  the
              increment,  NCSTEP,  should    be  positive    for  normal
              left-to-right     frame   advances,   and   negative   for
              right-to-left  advances.   The  setting of  BYROWS selects
              whether frames in displayed  in  row order, or  in  column
              order.