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diff --git a/Trivac/src/FLDTH1.f b/Trivac/src/FLDTH1.f
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+*DECK FLDTH1
+      SUBROUTINE FLDTH1 (ISPLH,NEL,LL4,EVECT,MAT,VOL,IDL,KN)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Compute the averaged flux for a linear primal formulation of
+* the diffusion equation 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
+* ISPLH   type of triangular mesh-splitting (ISPLH.GT.1).
+* NEL     total number of finite elements.
+* LL4     order of the system matrices.
+* EVECT   variational coefficients of the flux. The information is
+*         contained in position EVECT(1) to EVECT(LL4).
+* MAT     mixture index assigned to each element.
+* VOL     volume of each element
+* IDL     position of the average flux component associated with each
+*         volume.
+* KN      element-ordered unknown list.
+*
+*Parameters: output
+* EVECT   averaged fluxes. The information is contained in positions
+*         EVECT(LL4+1) to EVECT(LL4+NEL).
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER    ISPLH,NEL,LL4,MAT(NEL),IDL(NEL),
+     1           KN(NEL*(18*(ISPLH-1)**2+8))
+      REAL       EVECT(LL4+NEL),VOL(NEL)
+*
+      IVAL=18*(ISPLH-1)**2+8
+      NUM1=0
+      SS=1.0/REAL(6*(ISPLH-1)**2)
+      DO 70 K=1,NEL
+      IF(MAT(K).EQ.0) GO TO 70
+      EVECT(IDL(K))=0.0
+      IF(VOL(K).EQ.0.0) GO TO 60
+      DO 50 I=1,6*(ISPLH-1)**2
+      IND1=KN(NUM1+I)
+      IF(IND1.EQ.0) GO TO 50
+      EVECT(IDL(K))=EVECT(IDL(K))+SS*EVECT(IND1)
+   50 CONTINUE
+   60 NUM1=NUM1+IVAL
+   70 CONTINUE
+      RETURN
+      END