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ZSHIFT-ARRAY

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