Subroutine:	irc_nonlin.

 Purpose:	Corrects raw data for nonlinearity and detector noise.

 Category:	IRAS.

 File:		irc_nonlin.shl.

 Author:	Do Kester

 Use:
	IRC_NONLIN ( detnr  	input		INTEGER
		      raw    	in/out		REAL
		      nraw	input		INTEGER
		      satsec 	input		INTEGER
		      bias )	input		REAL
	detnr    detector number (IRASES p II-12/3)
	raw      First word address for input values.
	nraw     Total nr of raw this call
	satsec   satcal modulo 100 for coherent noise of det 5
	bias	 'Arbitrary' offset w.r.t. compressed data

 Description:
	 IRC_NONLIN corrects the data in array RAW for nonlinearity of the
	feedback resister IRASES p VI-4.  For detectors 5, 19 and 43 coherent
	detector noise is subtracted according to IRASES p VI-3.  The data in
	RAW are replaced with the corrected ones.

 Externals:
 -

 References:
	Former routine name: CRNLIN.

 Updates:
	90 Oct  5 Sjag Steensma; Adapt for GIPSY,
	890109  Timo Prusti, unification of versions
       871006  WvO, Declared: real raw(*)