NAME:    
	xmm_3bands
  PURPOSE: 
	takes in a structure obtained by doing mrdfits on an emllist xmm 
	source list and modifies it to contain 3 fluxes, rates, etc per 
	object rather than 3 rows per object
	WARNING: This program will only work if the bands are in ascending 
	order
  CALLING SEQUENCE: 
	stout=xmm_3bands(str)
  INPUTS: 
	st: structure created by doing mrdfits on an emllist xmm source list
  OUTPUTS: 
    	stout: a structure containing the same info as str apart from a few 
		discarded fields and 3 fluxes, etc per object
  EXAMPLE: 
	st2=xmm_3bands(st1)
  DEPENDENCIES: 
	
  RESTRICTIONS: 
        UNTESTED
  CALLED PROCEDURES AND FUNCTIONS: 
	astrolib functions
  MODIFICATION HISTORY: 
     	06-Nov-2000  Original by Suzanne Aigrain
	08-Nov-2000  S. Aigrain modified to use corrected coords when present
	10-Nov-2000  S.Aigrain: adapted to deal with 3 bands only

(See /home/xmmssc/soft/idl/pro/dbcreate/xmm_3bands.pro)