Index: LMDZ6/trunk/libf/phylmd/phys_output_write_mod.F90
===================================================================
--- LMDZ6/trunk/libf/phylmd/phys_output_write_mod.F90	(revision 3233)
+++ LMDZ6/trunk/libf/phylmd/phys_output_write_mod.F90	(revision 3234)
@@ -1480,7 +1480,7 @@
         DO k = 2, klev
          DO i = 1, klon
-            zx_tmp_fi3d(i,k) = zphi(i,k)/RG + &
+            zx_tmp_fi3d(i,k) = zphi(i,k-1)/RG + &
                           (zphi(i,k)-zphi(i,k-1))/RG * &
-                          (paprs(i,k)-pplay(i,k))/(pplay(i,k)-pplay(i,k-1))
+                          (paprs(i,k)-pplay(i,k-1))/(pplay(i,k)-pplay(i,k-1))
          ENDDO
         ENDDO