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KY

 KY...........Number of sets of Y values.   If not  supplied, KY will be
              set to the index of the  last curve for which a value  has
              been set in Y(1,KY).  If KX .NE. KY, the last set of X  or
              Y values will be assumed  to apply to the remaining  ones.
              Thus, if there  are 3 sets  of Y values,  each having  the
              same X values,  set KY=3 and  KX=1, so that  the X  values
              need not  be input  three times.   If entries  beyond  the
              KY-th position are found in YSHIFT(*) or YFACT(*), and  KY
              is being determined automatically, then the KY-th set of Y
              values will be automatically  copied into succeeding  sets
              and KY incremented accordingly.