#FILE = CCHAR.RAT  FOR RATFOR.RAT
   COMMON /CCHAR/ EXTDIG(10), INTDIG(10), EXTLET(26), INTLET(26),
      EXTBIG(26), INTBIG(26), EXTCHR(NCHARS), INTCHR(NCHARS),
      EXTBLK, INTBLK
      CHARACTER EXTDIG 	# EXTERNAL REPRESENTATION OF DIGITS
      CHARACTER INTDIG 	# INTERNAL REP (ASCII)
      CHARACTER EXTLET 	# EXTERNAL REP OF LETTERS (NORMAL CASE)
      CHARACTER INTLET 	# INTERNAL REP (ASCII LOWER CASE)
      CHARACTER EXTBIG 	# EXTERNAL REP OF UPPER CASE, IF USED
      CHARACTER INTBIG 	# INTERNAL REP (UPPER CASE ASCII)
      CHARACTER EXTCHR 	# EXTERNAL REP OF SPECIAL CHARS
      CHARACTER INTCHR 	# INTERNAL REP (ASCII)
      CHARACTER EXTBLK  	# EXTERNAL BLANK
      CHARACTER INTBLK 	# INTERNAL BLANK (ASCII)