diff --git a/doc/airfoil.png b/doc/airfoil.png
index 9091cb9..3404eea 100644
Binary files a/doc/airfoil.png and b/doc/airfoil.png differ
diff --git a/doc/thin_fracture.png b/doc/thin_fracture.png
new file mode 100644
index 0000000..7df2570
Binary files /dev/null and b/doc/thin_fracture.png differ
diff --git a/input/06_airfoil_from_csv.para b/input/06_airfoil_from_csv.para
index 1c5518e..c1c0038 100644
--- a/input/06_airfoil_from_csv.para
+++ b/input/06_airfoil_from_csv.para
@@ -3,10 +3,10 @@
 #===========================================================
  
 #-----------------------------------------------------------
-#                     MESH DEFINITION
+#                   OUTER MESH DEFINITION
 #-----------------------------------------------------------
 Define mesh:
-  Element size: 0.004 
+  Element size: 0.003 
   Element color: 1
   Meshing algorithm: Triangulation
   Number of quad refinements: 0
@@ -22,21 +22,21 @@ Define mesh:
 
   Define interior boundary from CSV file: ../auxiliary/test_data/Airfoil.csv
 
-  Add quad layers: 0.69132, 0.09754, 0.69132, 0.09754, 10, 0.0005, 1.10
+  Add quad layers: 0.69132, 0.09754, 0.69132, 0.09754, 10, 0.0004, 1.10
 
   #---------------------------------------------------------
   #                     LOCAL REFINEMENT     
   #---------------------------------------------------------
   Define fixed vertices:
-    0.69095,0.09625, 0.0020,0.02
-    0.85985,0.07582, 0.0008,0.005
+    0.69095, 0.09625, 0.0020, 0.02
+    0.85985, 0.07582, 0.0008, 0.005
   End fixed vertices
 
 End mesh
 
 
 #-----------------------------------------------------------
-#                          Mesh #3 
+#                   INNER MESH DEFINITION 
 #-----------------------------------------------------------
 Define mesh:
   Element size: 0.003 
diff --git a/input/08_thin_fracture.para b/input/08_thin_fracture.para
index f6dcd27..fbf4972 100644
--- a/input/08_thin_fracture.para
+++ b/input/08_thin_fracture.para
@@ -14,8 +14,8 @@ Define mesh:
   Number of smoothing iterations: 3
 
   # Output formats: COUT, TXT, VTU
-  Output file format: TXT
-  Output file prefix: ./frac2d-quad
+  Output file format: VTU
+  Output file prefix: ./thin_fracture
 
   #---------------------------------------------------------
   #                        BOUNDARIES
diff --git a/src/examples/06_airfoil_from_csv.cpp b/src/examples/06_airfoil_from_csv.cpp
index 0bb51fe..88bbf5e 100644
--- a/src/examples/06_airfoil_from_csv.cpp
+++ b/src/examples/06_airfoil_from_csv.cpp
@@ -32,12 +32,18 @@ void airfoil_from_csv()
   /*------------------------------------------------------------------
   | Define the size function
   ------------------------------------------------------------------*/
-  UserSizeFunction f_outer = [](const Vec2d& p) { return 0.003; };
+  UserSizeFunction f_outer = [](const Vec2d& p) { return 0.004; };
 
   Domain outer_domain { f_outer };
   outer_domain.add_exterior_boundary().set_shape_circle(1, {0.77, 0.09}, 0.14, 60);
   outer_domain.add_interior_boundary().set_shape_from_csv(csv_file);
 
+  /*------------------------------------------------------------------
+  | We use some additional fixed vertices to locally refine the mesh
+  ------------------------------------------------------------------*/
+  outer_domain.add_fixed_vertex(0.69095, 0.09625, 0.0020, 0.02);
+  outer_domain.add_fixed_vertex(0.85985, 0.07582, 0.0008, 0.005);
+
   /*------------------------------------------------------------------
   | Initialize the outer mesh
   ------------------------------------------------------------------*/
@@ -53,7 +59,7 @@ void airfoil_from_csv()
   ------------------------------------------------------------------*/
   generator.quad_layer_generation(outer_mesh)
     .n_layers(10)
-    .first_height(0.0003)
+    .first_height(0.0004)
     .growth_rate(1.10)
     .starting_position({0.69132,0.09754})
     .ending_position({0.69132,0.09754})