Function:     ircc_detnr

Purpose:      Returns IRAS detector numbers.

Category:     IR

File:         ircc_const.c

Author:       P.R. Roelfsema

Use:          INTEGER IRCC_DETNR(  det        ,  I  integer
                                   instrument )  I  character*(*)

              IRCC_DETNR  > 0 - detector number of detnr for instrument.
                           -1 - unknown instrument
              DET         Sequential detector number; 1 - IRCC_NDETS .
              INSTRUMENT  Instrument name; this can be a combination 
                          of a mode and band name e.g.:
                          SURVEY B1, SURVEY B2, SPLINEB 3, AO B4, 
                          SURVEY LRS etc.
                          ( see also IRCC_INSTRNAME )

Updates:      Aug  8, 1990: PRR, Creation date
              Nov 26, 1990: PRR, Rearranged LRS detector numbers.