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+*DECK FLDBH1
+      SUBROUTINE FLDBH1 (NEL,NUN,LL4,EVECT,VOL,IDL,KN,QFR)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Calculation of the averaged flux with a mesh centered finite
+* difference method in hexagonal geometry with triangular
+* mesh-splitting.
+*
+*Copyright:
+* Copyright (C) 2002 Ecole Polytechnique de Montreal
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation; either
+* version 2.1 of the License, or (at your option) any later version
+*
+*Author(s): A. Hebert
+*
+*Parameters: input
+* NEL     number of hexagons.
+* NUN     number of unknowns per energy group.
+* LL4     order of the system matrices.
+* EVECT   variational coefficients of the flux. The information is
+*         contained in position EVECT(1) to EVECT(LL4).
+* VOL     volume of each element.
+* IDL     position of the average flux component associated with each
+*         volume.
+* KN      element-ordered unknown list.
+* QFR     element-ordered information.
+*
+*Parameters: output
+* EVECT   averaged fluxes. The information is contained in positions
+*         EVECT(IDL(I)).
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER NEL,NUN,LL4,IDL(NEL),KN(4*LL4)
+      REAL EVECT(NUN),VOL(NEL),QFR(4*LL4)
+*
+      NSURF=3
+      DO 10 K=1,NEL
+      IF(IDL(K).NE.0) EVECT(IDL(K))=0.0
+   10 CONTINUE
+      NUM1=0
+      DO 20 IND1=1,LL4
+      K=KN(NUM1+NSURF+1)
+      EVECT(IDL(K))=EVECT(IDL(K))+QFR(NUM1+NSURF+1)*EVECT(IND1)/VOL(K)
+      NUM1=NUM1+NSURF+1
+   20 CONTINUE
+      RETURN
+      END