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X-ARRAY

 X(*,*).......X(I,K) is  point  I in  curve  K.   X values  must  be  in
              ***ASCENDING***  order  if   integration,  averaging,   or
              differentiation  of  the   input  curves  are   requested.
              Interpolation can  be done  for  arbitrary curves  in  the
              plane, including closed ones signalled by the first  point
              being the same  as the last  point.  For histogram  plots,
              histogram bar I in curve K has width BWIDTH(K), center  at
              X(I,K), bottom at YBASE(K), and top at Y(I,K).