C @(#)prflch.for	17.1.1.1 (ES0-DMD) 01/25/02 17:15:44
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.IDENTIFICATION
C  subroutine PRFLCH         version 2.0       870725
C  A. Kruszewski             ESO Garching
C.KEYWORDS
C  profiles
C.PURPOSE
C  It checks if an average profile AVPR goes down with the increasing
C  radius K at least as steep as p.s.f. multiplied by a factor DNEB.
C  If not then a value of an image size LIM is adjusted.
C.INPUT/OUTPUT
C  input arguments
C  AVPR        real*4 array      one-dimensional profile
C  LIM         integer*4         number of significant profile rings
C  KSAT        integer*4         number of saturated profile rings
C  HCUT        real*4            saturation level
C  STPR        real*4 array      logarithmic p.s.f.
C  DNEB        integer*4         rejection factor
C  output arguments
C  LIM         integer*4         number of significant profile rings
C-----------------------------------------------------------------------
       SUBROUTINE PRFLCH(AVPR, IHED, KSAT, HCUT, APSF, DNEB , LIM)
C
       IMPLICIT NONE
C
       INTEGER   IHED
       REAL      APSF(0:IHED)
       INTEGER   KSAT
       REAL      HCUT
       REAL      AVPR(0:IHED)
       REAL      DNEB
       INTEGER   LIM
C
       INTEGER   IC
       INTEGER   KK, KL
       REAL      TEMP
C
       IC = 0
       KK = MAX(KSAT+2,3)
       IF (KK .GE. LIM) THEN
          RETURN
       ENDIF
       KL = KK - 1
       IF (KL .LT. 0) THEN
          RETURN
       ENDIF
C
10     CONTINUE
       IF (.NOT.(KK.LE.LIM .AND. AVPR(KK).GT.0.0 .AND. IC.EQ.0)) THEN
          GOTO 20
       ENDIF
       TEMP   = (AVPR(KL)/AVPR(KK)) - DNEB*(APSF(KL)/APSF(KK))
       IF (TEMP .LT. 0.0) THEN
          IC = 1
       ENDIF
       KK = KK + 1
       GOTO 10
C
20     CONTINUE
       IF (IC .EQ. 1) THEN
           LIM = MAX(KK-1, 4)
       ENDIF
C
       RETURN
       END