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XSHIFT-ARRAY

 XSHIFT(*)....Shift constants for  X data.  XSHIFT(K)  will be added  to
              X(*,K) ***AFTER*** multiplying the input X(*,K) values  by
              XFACT(*).  After use, XSHIFT(K) is  reset to 0.0 to  avoid
              shifting the data again  if it is  reused on a  subsequent
              pass with RESET=.FALSE.