C @(#)fdtotd.for	17.1.1.1 (ES0-DMD) 01/25/02 17:15:40
C===========================================================================
C Copyright (C) 1995 European Southern Observatory (ESO)
C
C This program is free software; you can redistribute it and/or 
C modify it under the terms of the GNU General Public License as 
C published by the Free Software Foundation; either version 2 of 
C the License, or (at your option) any later version.
C
C This program is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
C GNU General Public License for more details.
C
C You should have received a copy of the GNU General Public 
C License along with this program; if not, write to the Free 
C Software Foundation, Inc., 675 Massachusetss Ave, Cambridge, 
C MA 02139, USA.
C
C Corresponding concerning ESO-MIDAS should be addressed as follows:
C	Internet e-mail: midas@eso.org
C	Postal address: European Southern Observatory
C			Data Management Division 
C			Karl-Schwarzschild-Strasse 2
C			D 85748 Garching bei Muenchen 
C			GERMANY
C===========================================================================
C
C+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
C.INPUT/OUTPUT
C  Input parameters
C  A4        real*4 array       four dimensional p.s.f.
C  LPXL      integer*4          half-size in pixels
C  LSBP      integer*4          half-size in sub-pixels
C  LL        integer*4          half-size of 2-d p.s.f.
C  Output parameters
C  A2        real*4 array       two dimensional p.s.f.
C-----------------------------------------------------------------------
C
C
      SUBROUTINE FDTOTD(A4, A2, LPXL, LSBP, LL)
C
      IMPLICIT  NONE
      INTEGER   LPXL
      INTEGER   LSBP
      INTEGER   LL
      REAL      A4((-LPXL):LPXL,(-LPXL):LPXL,(-LSBP):LSBP,(-LSBP):LSBP)
      REAL      A2((-LL):LL,(-LL):LL)
C
      INTEGER   I, IK
      INTEGER   J, JL
      INTEGER   K
      INTEGER   L
C
C
      DO 10 L = -LSBP , LSBP
          DO 20 K = -LSBP , LSBP
              DO 30 J = -LPXL , LPXL
                  JL = J * (2*LSBP+1) - L
                  DO 40 I = -LPXL , LPXL
                      IK = I * (2*LSBP+1) - K
                      A2(IK,JL) = A4(I,J,K,L)
   40             CONTINUE
   30         CONTINUE
   20     CONTINUE
   10 CONTINUE
C
      RETURN
      END