Algorithm

	read keywords RAOFFSET , DEOFFSET and LIKHOOD.
	
	Evaluate RAOFFSET , DEOFFSET and LIKHOOD setting POSCOROK accordingly.

	Set SYSERRCC depending on POSCOROK.

	Write SYSERRCC and POSCOROK to ouput.

	Replace RA_CORR , DEC_CORR , LII_CORR and BII_CORR with RA , DEC , LII and BII respectively
	if POSCOROK = F.