;+
;  NAME: 
;     DOSTACK_WCS
;
;  PURPOSE:
;     Do the stacking of a catalog of sources in WCS (contrary to
;     dostack_xy where stacking is performed on image coordinates)
;
;  EXPLANATION:
;
;  CALLING SEQUENCE: 
;     dostack_wcs, image, RA, DEC, header, img_stack, _EXTRA=_extra
;
;  INPUTS:     
;     IMAGE   : input image 
;     RA   : RA coordinates of the sources to stack (DECIMAL DEGREES)
;     DEC   : DEC coordinates of the sources to stack (DECIMAL DEGREES)
;     HEADER: header of the input image
;
;  OUTPUTS:   
;     IMG_STACK : 2D array of the result of the stacking. It
;                  corresponds, either to the mean or to the
;                  median. This array has 2*size+1 x 2*size+1 elements.
;
;  OPTIONAL OUTPUT KEYWORDS:
;      _EXTRA: read dostack_xy.pro for details
;
;  EXAMPLE:
;
;  MODIFICATION HISTORY:
;       Written by Alexandre Beelen: dec 2009
;
;     Copyright Insitut d'Astrophysique Spatiale
;
;     This program is free software: you can redistribute it and/or modify
;     it under the terms of the GNU General Public License as published by
;     the Free Software Foundation, either version 2 of the License, or
;     (at your option) any later version.
;
;     This program is distributed in the hope that it will be useful,
;     but WITHOUT ANY WARRANTY; without even the implied warranty of
;     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;     GNU General Public License for more details.
;
;     You should have received a copy of the GNU General Public License
;     along with this program.  If not, see <http://www.gnu.org/licenses/>.
;
;-      

PRO dostack_wcs, image, RA, DEC, header, img_stack, _EXTRA=_extra

adxy,header,ra,dec,x,y

dostack_xy,image,x,y,img_stack,_EXTRA=_extra

END