Subroutine:	IRC_DN2SPLINES

 Purpose:	Converts 16 bit splineI-format FITS integers to reals.

 Category:	IRAS.

 File:		irc_dn2splines.shl.

 Author:	Do Kester	do@guspace.rug.nl

 Use: 	IRC_DN2SPLINES(
		        REALS		i/o		REAL(N)
		        N )		input		INTEGER
	REALS	datanumbers to be converted to splines
	N	Number of conversions.

 Description:
	This subroutine is the inverse of srrr16.
	Description of IMPUT format:
		Low range :  [0,  32767]; stepsize: 1/32,
		High range:[32896, 65536]; stepsize: 4.
	The high range has an offset of -32767.
	The range between [32768, 32895] is not use

	Description of OUTPUT format:
		Low range : [0, 1023.984375]; stepsize: 1/32,
		High range: [1024, 131072]; stepsize: 4.
		
 Externals:
	-
 References:    
	Former routine name: SRR16R.

 Updates:
	90 Oct  5 Sjag Steensma; Adapt for GIPSY,
       84 Oct 09  Wim van Oosterom; original code.