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YBASE-ARRAY

 YBASE(*).....For histogramming,  YBASE(K)  is  the base  point  of  the
              histogram bars  for curve  K.  Thus,  points Y(I,K)  which
              exceed YBASE(K) will have bars going upward, while  points
              Y(I,K) below YBASE(K) will have bars going downward.   The
              default value for YBASE(K) is YMIN.