diff --git a/src/main.cpp b/src/main.cpp
index e122cb5b90fe82c950cc5495f085b833d344d5b8..e4df1a5e7b9ff2932613f39133a43c5abc28df8c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -180,10 +180,11 @@ int main(int argc, char *argv[])
     
     { // gnuplot output for density
       const Kokkos::View<const Rd*> xj   = mesh_data.xj();
-      const Kokkos::View<const double*> rhoj = unknowns.rhoj();
-      std::ofstream fout("rho");
+      const Kokkos::View<const Rd*> uj = unknowns.uj();
+      double pi = 4.*std::atan(1.);
+      std::ofstream fout("comparaison u");
       for (size_t j=0; j<mesh.numberOfCells(); ++j) {
-        fout << xj[j][0] << ' ' << rhoj[j] << '\n';
+	fout << xj[j][0] << ' ' << uj[j][0] <<  ' ' << std::sin(pi*xj[j][0])*std::exp(-pi*pi*0.2) <<'\n';
       }
     }
 
diff --git a/src/scheme/FiniteVolumesDiffusion.hpp b/src/scheme/FiniteVolumesDiffusion.hpp
index 93440138cd94977100025b5a76d1ba7457de3298..74e59d14f8d4dd0d471f8b0a0d12b439b0bdddc0 100644
--- a/src/scheme/FiniteVolumesDiffusion.hpp
+++ b/src/scheme/FiniteVolumesDiffusion.hpp
@@ -102,7 +102,7 @@ private:
 
         // k = 1
 	 
-	m_Fl(l)= (1./(2*Vl(l)))*sum;
+	m_Fl(l)= (1./Vl(l))*sum;
 
       });