diff --git a/dune/microstructure/prestrainedMaterial.hh b/dune/microstructure/prestrainedMaterial.hh
index 8d76ac83bcb15523fdb6c180ecaf5c32590c40c9..d0fd35b0ca8571a7570338c340a573ef91658856 100644
--- a/dune/microstructure/prestrainedMaterial.hh
+++ b/dune/microstructure/prestrainedMaterial.hh
@@ -688,7 +688,7 @@ FieldMatrix<double,6,6> setupPhase(const std::string phaseType, Python::Module m
   {
         std::string outputPath = parameterSet_.get("outputPath", "../../outputs");
         using VTKGridType = YaspGrid<dim, EquidistantOffsetCoordinates<double, dim> >;
-        //VTKGridType grid_VTK({-1.0/2.0, -1.0/2.0, -1.0/2.0},{1.0/2.0, 1.0/2.0, 1.0/2.0},{80,80,80});
+        // VTKGridType grid_VTK({-1.0/2.0, -1.0/2.0, -1.0/2.0},{1.0/2.0, 1.0/2.0, 1.0/2.0},{80,80,80});
         VTKGridType grid_VTK({-1.0/2.0, -1.0/2.0, -1.0/2.0},{1.0/2.0, 1.0/2.0, 1.0/2.0},nElements);
         
         using GridViewVTK = VTKGridType::LeafGridView;
@@ -707,10 +707,10 @@ FieldMatrix<double,6,6> setupPhase(const std::string phaseType, Python::Module m
         
         VTKWriter<GridView> MaterialVtkWriter(gridView_VTK);
         
-        MaterialVtkWriter.addVertexData(
+        MaterialVtkWriter.addCellData(
             indicatorFunction_P0,
             VTK::FieldInfo("indicatorFunction_P0", VTK::FieldInfo::Type::scalar, 1));    
-        MaterialVtkWriter.addCellData(
+        MaterialVtkWriter.addVertexData(
             indicatorFunction_P1,
             VTK::FieldInfo("indicatorFunction_P1", VTK::FieldInfo::Type::scalar, 1));