!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer, 
!                     version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms 
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer 
!version 3 or (at your option) any later version that should be found at: 
!http://collaboration.cmc.ec.gc.ca/science/rpn.comm/license.html 
!
!This software 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 above mentioned License/Disclaimer for more details.
!You should have received a copy of the License/Disclaimer along with this software; 
!if not, you can write to: EC-RPN COMM Group, 2121 TransCanada, suite 500, Dorval (Quebec), 
!CANADA, H9P 1J3; or send e-mail to service.rpn@ec.gc.ca
!-------------------------------------- LICENCE END --------------------------------------

      SUBROUTINE DIFUVD9 (SE, STAGE, S, n, NK, KA)
#include "impnone.cdk"
      INTEGER n, NK, KA
      REAL SE(n,NK), S(n,NK)
      LOGICAL STAGE
*
      INTEGER K, I
      LOGICAL INIT
      DATA INIT /.TRUE./
      SAVE INIT
*
*Author
*          R. Benoit (Mar 89)
*
*Object
*          to calculate the centered sigma levels
*
*Arguments
*
*          - Output -
* SE       sigma levels for ('E')
*
*          - Input -
* STAGE    .TRUE. for 'E' (staggered) level intervals
* S        sigma levels
* N        1st horizontal dimension
* NK       vertical dimension
* KA       level to extract
*
**
*
1000  CONTINUE
*
      IF (STAGE) THEN
*
         DO 1 K=1,KA-1
            do 1 i=1,n
1           SE(i,K)=(S(i,K)+S(i,K+1))/2
         DO 4 K=KA,NK
            do 4 i=1,n
4           SE(i,K)=1
      ELSE
*
         DO 2 K=1,NK
            do 2 i=1,n
2           SE(i,K)=S(i,K)
      ENDIF
*
      IF (INIT) THEN
*
*     PRINT *,' S/R DIFUVD9...STAGE= ',STAGE
*     PRINT '(3A10/(I10,2F10.6))' , 'K','S(1,K)','SE(1,K)',
*    %                              (K,S(1,K),SE(1,K),K=1,NK)
*     PRINT *,' KA=',KA,' NK=',NK
*     IF (KA.LT.NK) PRINT *,'  '
*     IF (KA.LT.NK) PRINT *,' ***************************'
*     IF (KA.LT.NK) PRINT *,' * ANEMOMETRE 5M INACTIF   *'
*     IF (KA.LT.NK) PRINT *,' ***************************'
*     IF (KA.LT.NK) PRINT *,'  '
*     PRINT *,' RAPPORT DE CENTRAGE DU NIVEAU KA au point 1'
*     PRINT *,' (1-S(1,KA))/(1-S(1,KA-1))=',(1-S(1,KA))/(1-S(1,KA-1))
      INIT = .FALSE.
      ENDIF
*
      RETURN
      end