CKNPAR    CKNPAR    CKNPAR    CKNPAR    CKNPAR    CKNPAR    CKNPAR    
          **********************************************
                    **************************
                              ******

SUBROUTINE CKNPAR (LINE, NPAR, LOUT, IPAR, ISTART, KERR)
Searches a character string LINE from last to first character,
to create a substring IPAR containing NPAR blank-delimited numbers;
ISTART is the column of LINE containing IPAR. This allows format-
free input of combined alpha-numeric data.  For example,

   input:  LINE*80   = "t1 t2 dt  300.0  3.0E3  50"
           NPAR      = 3, the number of substrings requested
           LOUT      = 6, a logical unit number on which to write
                       diagnostic messages.
   output: IPAR*80   = "300.0  3.0E3  50"
           ISTART    = 13, the starting column in LINE of the
                       NPAR substrings
           KERR      = .FALSE.

INPUT
LINE      - Character string; length determined by calling routine.
NPAR      - Integer scalar, number of substrings expected.
LOUT      - Integer scalar, output unit for printed diagnostics.

OUTPUT
IPAR      - Character string, subset of LINE, containing only the
            NPAR substrings.
ISTART    - Integer scalar, starting location in LINE of the NPAR
            substrings.
KERR      - Logical, character length or syntax error flag.