 INTEGER
          The maximum number of iterations.  ITMAX2 &gt;= 0.

  NPRINT  (input) INTEGER
          This parameter enables controlled printing of iterates if
          it is positive. In this case, FCN is called with IFLAG = 0
          at the beginning of the first iteration and every NPRINT
          iterations thereafter and immediately prior to return,
          and the current error norm is printed. Other intermediate
          results could be printed by modifying the corresponding
          FC