diff --git a/Arrangement_on_surface_2/demo/earth/Aos.cpp b/Arrangement_on_surface_2/demo/earth/Aos.cpp
index 3e572107014..d7552f10ced 100644
--- a/Arrangement_on_surface_2/demo/earth/Aos.cpp
+++ b/Arrangement_on_surface_2/demo/earth/Aos.cpp
@@ -306,11 +306,23 @@ std::vector<QVector3D> Aos::ext_check(const Kml::Placemarks& placemarks)
     auto& d = vit->data();
     if (vit->data().v == false)
     {
+      if (2 == vit->degree())
+        ;//continue;
+
+      if (1 == vit->degree())
+      {
+        std::cout << "1-deg vertex: " << std::boolalpha << vit->incident_halfedges()->target()->data().v << std::endl;
+      }
+
+
       num_created_vertices++;
       auto p = vit->point();
       auto ap = approx(p);
       QVector3D new_vertex(ap.dx(), ap.dy(), ap.dz());
+      new_vertex.normalize();
       std::cout << new_vertex << std::endl;
+      std::cout << "degree = " << vit->degree() << std::endl;
+      
       created_vertices.push_back(new_vertex);
 
       // find the arcs that are adjacent to this vertex
diff --git a/Arrangement_on_surface_2/demo/earth/Kml_reader.cpp b/Arrangement_on_surface_2/demo/earth/Kml_reader.cpp
index 98fc4949ce7..0c2dbc32041 100644
--- a/Arrangement_on_surface_2/demo/earth/Kml_reader.cpp
+++ b/Arrangement_on_surface_2/demo/earth/Kml_reader.cpp
@@ -29,6 +29,11 @@ QVector3D Kml::Node::get_coords_3f(const double r) const
   const auto v = get_coords_3d(r);
   return QVector3D(v.x, v.y, v.z);
 }
+std::ostream& operator << (std::ostream& os, const Kml::Node& n)
+{
+  os << n.lon << ", " << n.lat;
+  return os;
+}
 
 
 Kml::Placemarks  Kml::read(const std::string& file_name)
diff --git a/Arrangement_on_surface_2/demo/earth/Kml_reader.h b/Arrangement_on_surface_2/demo/earth/Kml_reader.h
index eda3c77a4c2..d51cca15ea8 100644
--- a/Arrangement_on_surface_2/demo/earth/Kml_reader.h
+++ b/Arrangement_on_surface_2/demo/earth/Kml_reader.h
@@ -25,11 +25,7 @@ public:
     bool operator == (const Node& r) const;
     Vec3d get_coords_3d(const double r = 1.0) const;
     QVector3D get_coords_3f(const double r=1.0) const;
-    friend std::ostream& operator << (std::ostream& os, const Node& n)
-    {
-      os << n.lon << ", " << n.lat;
-      return os;
-    }
+    friend std::ostream& operator << (std::ostream& os, const Node& n);
   };
   using Nodes = std::vector<Node>;
 
diff --git a/Arrangement_on_surface_2/demo/earth/Main_widget.cpp b/Arrangement_on_surface_2/demo/earth/Main_widget.cpp
index f9349348b04..78cf160b599 100644
--- a/Arrangement_on_surface_2/demo/earth/Main_widget.cpp
+++ b/Arrangement_on_surface_2/demo/earth/Main_widget.cpp
@@ -206,7 +206,7 @@ void readShapefile(const std::string& filename) {
 
 void Main_widget::initializeGL()
 {
-  readShapefile("C:/work/gsoc2023/data/ne_110m_admin_0_countries/ne_110m_admin_0_countries.shp");
+  //readShapefile("C:/work/gsoc2023/data/ne_110m_admin_0_countries/ne_110m_admin_0_countries.shp");
 
   //const auto file_name = "C:/work/gsoc2023/data/world_countries.kml";
   const auto file_name = "C:/work/gsoc2023/data/ne_110m_admin_0_countries.kml";
@@ -214,7 +214,7 @@ void Main_widget::initializeGL()
   auto dup_nodes = Kml::get_duplicates(m_countries);
   
   // initialize rendering of DUPLICATE VERTICES
-  if(1)
+  if(0)
   {
     std::vector<QVector3D> vertices;
     for (const auto& node : dup_nodes)
@@ -493,7 +493,7 @@ void Main_widget::paintGL()
     const QVector4D vertex_color(1, 0, 0, 1);
     sp.set_uniform("u_color", vertex_color);
     glPointSize(5);
-    //m_vertices->draw();
+    m_vertices->draw();
 
     sp.unuse();
   }