diff --git a/src/db/db/dbAsIfFlatEdges.cc b/src/db/db/dbAsIfFlatEdges.cc
index caf35e5d4..0928e3fcb 100644
--- a/src/db/db/dbAsIfFlatEdges.cc
+++ b/src/db/db/dbAsIfFlatEdges.cc
@@ -110,7 +110,7 @@ AsIfFlatEdges::selected_interacting_generic (const Region &other, EdgeInteractio
     scanner.insert1 (e.operator-> (), 0);
   }
 
-  AddressablePolygonDelivery p = other.addressable_polygons ();
+  AddressablePolygonDelivery p = (mode == EdgesInside ? other.addressable_merged_polygons () : other.addressable_polygons ());
 
   for ( ; ! p.at_end (); ++p) {
     scanner.insert2 (p.operator-> (), 1);
@@ -156,7 +156,8 @@ AsIfFlatEdges::selected_interacting_generic (const Edges &edges, EdgeInteraction
     scanner.insert (e.operator-> (), 0);
   }
 
-  AddressableEdgeDelivery ee = edges.addressable_edges ();
+  //  NOTE: "inside" needs merged edges for the other edges as the algorithm works edge by edge
+  AddressableEdgeDelivery ee = (mode == EdgesInside ? edges.addressable_merged_edges () : edges.addressable_edges ());
 
   for ( ; ! ee.at_end (); ++ee) {
     scanner.insert (ee.operator-> (), 1);
@@ -206,7 +207,7 @@ AsIfFlatEdges::selected_interacting_pair_generic (const Region &region, EdgeInte
     scanner.insert1 (e.operator-> (), 0);
   }
 
-  AddressablePolygonDelivery p = region.addressable_polygons ();
+  AddressablePolygonDelivery p = region.addressable_merged_polygons ();
 
   for ( ; ! p.at_end (); ++p) {
     scanner.insert2 (p.operator-> (), 1);
@@ -250,7 +251,7 @@ AsIfFlatEdges::selected_interacting_pair_generic (const Edges &other, EdgeIntera
     scanner.insert (e.operator-> (), 0);
   }
 
-  AddressableEdgeDelivery ee = other.addressable_edges ();
+  AddressableEdgeDelivery ee = other.addressable_merged_edges ();
 
   for ( ; ! ee.at_end (); ++ee) {
     scanner.insert (ee.operator-> (), 1);
diff --git a/src/db/db/dbDeepEdges.cc b/src/db/db/dbDeepEdges.cc
index 1e600ba76..f76a2d2b2 100644
--- a/src/db/db/dbDeepEdges.cc
+++ b/src/db/db/dbDeepEdges.cc
@@ -387,7 +387,7 @@ DeepEdges::has_valid_edges () const
 bool
 DeepEdges::has_valid_merged_edges () const
 {
-  return merged_semantics ();
+  return false;
 }
 
 const db::RecursiveShapeIterator *
@@ -1613,7 +1613,7 @@ DeepEdges::selected_interacting_generic (const Region &other, EdgeInteractionMod
   proc.set_base_verbosity (base_verbosity ());
   proc.set_threads (edges.store ()->threads ());
 
-  proc.run (&op, edges.layer (), other_deep->deep_layer ().layer (), dl_out.layer ());
+  proc.run (&op, edges.layer (), (mode == EdgesInside ? other_deep->merged_deep_layer () : other_deep->deep_layer ()).layer (), dl_out.layer ());
 
   return new db::DeepEdges (dl_out);
 }
@@ -1645,7 +1645,7 @@ DeepEdges::selected_interacting_pair_generic (const Region &other, EdgeInteracti
   proc.set_base_verbosity (base_verbosity ());
   proc.set_threads (edges.store ()->threads ());
 
-  proc.run (&op, edges.layer (), other_deep->deep_layer ().layer (), output_layers);
+  proc.run (&op, edges.layer (), other_deep->merged_deep_layer ().layer (), output_layers);
 
   return std::make_pair (new db::DeepEdges (dl_out), new db::DeepEdges (dl_out2));
 }
@@ -1671,7 +1671,7 @@ DeepEdges::selected_interacting_generic (const Edges &other, EdgeInteractionMode
   proc.set_base_verbosity (base_verbosity ());
   proc.set_threads (edges.store ()->threads ());
 
-  proc.run (&op, edges.layer (), other_deep->deep_layer ().layer (), dl_out.layer ());
+  proc.run (&op, edges.layer (), (mode == EdgesInside ? other_deep->merged_deep_layer () : other_deep->deep_layer ()).layer (), dl_out.layer ());
 
   return new db::DeepEdges (dl_out);
 }
@@ -1703,7 +1703,7 @@ DeepEdges::selected_interacting_pair_generic (const Edges &other, EdgeInteractio
   proc.set_base_verbosity (base_verbosity ());
   proc.set_threads (edges.store ()->threads ());
 
-  proc.run (&op, edges.layer (), other_deep->deep_layer ().layer (), output_layers);
+  proc.run (&op, edges.layer (), other_deep->merged_deep_layer ().layer (), output_layers);
 
   return std::make_pair (new db::DeepEdges (dl_out), new db::DeepEdges (dl_out2));
 }
diff --git a/src/db/unit_tests/dbDeepEdgesTests.cc b/src/db/unit_tests/dbDeepEdgesTests.cc
index 4b6e9b89c..94ddbf425 100644
--- a/src/db/unit_tests/dbDeepEdgesTests.cc
+++ b/src/db/unit_tests/dbDeepEdgesTests.cc
@@ -604,11 +604,13 @@ TEST(11_SelectedInsideWithRegion)
   e.insert (db::Edge (1600, -400, 1600, -200));
   e.insert (db::Edge (1700, 1500, 1600, 2500));
   e.insert (db::Edge (1800, 2500, 1800, 3500));
+  e.insert (db::Edge (1900, 1000, 1900, 2000));
   e.insert (db::Edge (-1500, 0, -1500, 1000));
 
   db::Region r;
   r.insert (db::Box (0, -1000, 2000, 0));
-  r.insert (db::Box (1000, 1000, 2000, 2000));
+  r.insert (db::Box (1000, 1000, 2000, 1500));
+  r.insert (db::Box (1000, 1500, 2000, 2000));
 
   //  make deep
 
@@ -631,28 +633,28 @@ TEST(11_SelectedInsideWithRegion)
   r = db::Region (db::RecursiveShapeIterator (ly, top_cell, l2), dss);
 
   EXPECT_EQ (db::compare (e.selected_inside (db::Region ()), ""), true);
-  EXPECT_EQ (db::compare (e.selected_not_inside (db::Region ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_inside (db::Region ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (db::Region ()).first, ""), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (db::Region ()).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (db::Region ()).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside (r), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_not_inside (r), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside_differential (r).first, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside_differential (r).second, ""), true);
-  EXPECT_EQ (db::compare (e.selected_inside (r), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (e.selected_inside (rflat), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (eflat.selected_inside (r), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside (r), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside (rflat), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_inside (r), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_inside (r), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_inside (rflat), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (eflat.selected_not_inside (r), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (r).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (rflat).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (eflat.selected_inside_differential (r).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (r).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (rflat).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_inside_differential (r).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (r).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (rflat).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (eflat.selected_inside_differential (r).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
 }
 
-TEST(11_SelectedInsideWithEdges)
+TEST(12_SelectedInsideWithEdges)
 {
   db::Edges e;
   e.insert (db::Edge (0, 0, 0, 1000));
@@ -666,6 +668,7 @@ TEST(11_SelectedInsideWithEdges)
   e.insert (db::Edge (1600, -400, 1600, -200));
   e.insert (db::Edge (1700, 1500, 1600, 2500));
   e.insert (db::Edge (1800, 2500, 1800, 3500));
+  e.insert (db::Edge (1900, 1000, 1900, 2000));
   e.insert (db::Edge (-1500, 0, -1500, 1000));
 
   db::Edges ee;
@@ -673,7 +676,8 @@ TEST(11_SelectedInsideWithEdges)
     ee.insert (db::Edge (i, -1000, i, 0));
   }
   for (int i = 1000; i <= 2000; i += 100) {
-    ee.insert (db::Edge (i, 1000, i, 2000));
+    ee.insert (db::Edge (i, 1000, i, 1500));
+    ee.insert (db::Edge (i, 1500, i, 2000));
   }
 
   //  make deep
@@ -697,28 +701,28 @@ TEST(11_SelectedInsideWithEdges)
   ee = db::Edges (db::RecursiveShapeIterator (ly, top_cell, l2), dss);
 
   EXPECT_EQ (db::compare (e.selected_inside (db::Edges ()), ""), true);
-  EXPECT_EQ (db::compare (e.selected_not_inside (db::Edges ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_inside (db::Edges ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (db::Edges ()).first, ""), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (db::Edges ()).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (db::Edges ()).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside (ee), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_not_inside (ee), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside_differential (ee).first, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside_differential (ee).second, ""), true);
-  EXPECT_EQ (db::compare (e.selected_inside (ee), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (e.selected_inside (eeflat), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (eflat.selected_inside (ee), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside (ee), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside (eeflat), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_inside (ee), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_inside (ee), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_inside (eeflat), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (eflat.selected_not_inside (ee), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (ee).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (eeflat).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (eflat.selected_inside_differential (ee).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (ee).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (eeflat).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_inside_differential (ee).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (ee).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (eeflat).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (eflat.selected_inside_differential (ee).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
 }
 
-TEST(12_SelectedOutsideWithRegion)
+TEST(13_SelectedOutsideWithRegion)
 {
   db::Edges e;
   e.insert (db::Edge (0, 0, 0, 1000));
@@ -732,11 +736,13 @@ TEST(12_SelectedOutsideWithRegion)
   e.insert (db::Edge (1600, -400, 1600, -200));
   e.insert (db::Edge (1700, 1500, 1600, 2500));
   e.insert (db::Edge (1800, 2500, 1800, 3500));
+  e.insert (db::Edge (1900, 1000, 1900, 2000));
   e.insert (db::Edge (-1500, 0, -1500, 1000));
 
   db::Region r;
   r.insert (db::Box (0, -1000, 2000, 0));
-  r.insert (db::Box (1000, 1000, 2000, 2000));
+  r.insert (db::Box (1000, 1000, 2000, 1500));
+  r.insert (db::Box (1000, 1500, 2000, 2000));
 
   //  make deep
 
@@ -758,9 +764,9 @@ TEST(12_SelectedOutsideWithRegion)
   db::Region rflat = r;
   r = db::Region (db::RecursiveShapeIterator (ly, top_cell, l2), dss);
 
-  EXPECT_EQ (db::compare (e.selected_outside (db::Region ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside (db::Region ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_outside (db::Region ()), ""), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (db::Region ()).first, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (db::Region ()).first, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (db::Region ()).second, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside (r), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_not_outside (r), ""), true);
@@ -769,18 +775,18 @@ TEST(12_SelectedOutsideWithRegion)
   EXPECT_EQ (db::compare (e.selected_outside (r), "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside (rflat), "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (eflat.selected_outside (r), "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_not_outside (r), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
-  EXPECT_EQ (db::compare (e.selected_not_outside (rflat), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
-  EXPECT_EQ (db::compare (eflat.selected_not_outside (r), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (r), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (rflat), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_not_outside (r), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (r).first, "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (rflat).first, "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (eflat.selected_outside_differential (r).first, "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (r).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (rflat).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
-  EXPECT_EQ (db::compare (eflat.selected_outside_differential (r).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (r).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (rflat).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_outside_differential (r).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1900,1000;1900,2000)"), true);
 }
 
-TEST(13_SelectedOutsideWithEdges)
+TEST(14_SelectedOutsideWithEdges)
 {
   db::Edges e;
   e.insert (db::Edge (0, 0, 0, 1000));
@@ -794,6 +800,7 @@ TEST(13_SelectedOutsideWithEdges)
   e.insert (db::Edge (1600, -400, 1600, -200));
   e.insert (db::Edge (1700, 1500, 1600, 2500));
   e.insert (db::Edge (1800, 2500, 1800, 3500));
+  e.insert (db::Edge (1900, 1000, 1900, 2000));
   e.insert (db::Edge (-1500, 0, -1500, 1000));
 
   db::Edges ee;
@@ -801,7 +808,8 @@ TEST(13_SelectedOutsideWithEdges)
     ee.insert (db::Edge (i, -1000, i, 0));
   }
   for (int i = 1000; i <= 2000; i += 100) {
-    ee.insert (db::Edge (i, 1000, i, 2000));
+    ee.insert (db::Edge (i, 1000, i, 1500));
+    ee.insert (db::Edge (i, 1500, i, 2000));
   }
 
   //  make deep
@@ -824,9 +832,9 @@ TEST(13_SelectedOutsideWithEdges)
   db::Edges eeflat = ee;
   ee = db::Edges (db::RecursiveShapeIterator (ly, top_cell, l2), dss);
 
-  EXPECT_EQ (db::compare (e.selected_outside (db::Edges ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside (db::Edges ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_outside (db::Edges ()), ""), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (db::Edges ()).first, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (db::Edges ()).first, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (db::Edges ()).second, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside (ee), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_not_outside (ee), ""), true);
@@ -835,14 +843,14 @@ TEST(13_SelectedOutsideWithEdges)
   EXPECT_EQ (db::compare (e.selected_outside (ee), "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside (eeflat), "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (eflat.selected_outside (ee), "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (e.selected_not_outside (eeflat), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (eflat.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (eeflat), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (ee).first, "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (eeflat).first, "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (eflat.selected_outside_differential (ee).first, "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (eeflat).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
-  EXPECT_EQ (db::compare (eflat.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (eeflat).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
 }
 
diff --git a/src/db/unit_tests/dbEdgesTests.cc b/src/db/unit_tests/dbEdgesTests.cc
index 8be4995f7..96d2d4068 100644
--- a/src/db/unit_tests/dbEdgesTests.cc
+++ b/src/db/unit_tests/dbEdgesTests.cc
@@ -980,23 +980,25 @@ TEST(24)
   e.insert (db::Edge (1600, -400, 1600, -200));
   e.insert (db::Edge (1700, 1500, 1600, 2500));
   e.insert (db::Edge (1800, 2500, 1800, 3500));
+  e.insert (db::Edge (1900, 1000, 1900, 2000));
   e.insert (db::Edge (-1500, 0, -1500, 1000));
 
   db::Region r;
   r.insert (db::Box (0, -1000, 2000, 0));
-  r.insert (db::Box (1000, 1000, 2000, 2000));
+  r.insert (db::Box (1000, 1000, 2000, 1500));
+  r.insert (db::Box (1000, 1500, 2000, 2000));
 
   EXPECT_EQ (db::compare (e.selected_inside (db::Region ()), ""), true);
-  EXPECT_EQ (db::compare (e.selected_not_inside (db::Region ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_inside (db::Region ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (db::Region ()).first, ""), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (db::Region ()).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (db::Region ()).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside (r), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_not_inside (r), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside_differential (r).first, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside_differential (r).second, ""), true);
-  EXPECT_EQ (db::compare (e.selected_inside (r), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside (r), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_inside (r), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (r).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (r).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (r).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
 }
 
@@ -1015,6 +1017,7 @@ TEST(25)
   e.insert (db::Edge (1600, -400, 1600, -200));
   e.insert (db::Edge (1700, 1500, 1600, 2500));
   e.insert (db::Edge (1800, 2500, 1800, 3500));
+  e.insert (db::Edge (1900, 1000, 1900, 2000));
   e.insert (db::Edge (-1500, 0, -1500, 1000));
 
   db::Edges ee;
@@ -1022,20 +1025,21 @@ TEST(25)
     ee.insert (db::Edge (i, -1000, i, 0));
   }
   for (int i = 1000; i <= 2000; i += 100) {
-    ee.insert (db::Edge (i, 1000, i, 2000));
+    ee.insert (db::Edge (i, 1000, i, 1500));
+    ee.insert (db::Edge (i, 1500, i, 2000));
   }
 
   EXPECT_EQ (db::compare (e.selected_inside (db::Edges ()), ""), true);
-  EXPECT_EQ (db::compare (e.selected_not_inside (db::Edges ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_inside (db::Edges ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (db::Edges ()).first, ""), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (db::Edges ()).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (db::Edges ()).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside (ee), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_not_inside (ee), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside_differential (ee).first, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_inside_differential (ee).second, ""), true);
-  EXPECT_EQ (db::compare (e.selected_inside (ee), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside (ee), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_inside (ee), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_inside_differential (ee).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (ee).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (ee).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
 }
 
@@ -1054,24 +1058,26 @@ TEST(26)
   e.insert (db::Edge (1600, -400, 1600, -200));
   e.insert (db::Edge (1700, 1500, 1600, 2500));
   e.insert (db::Edge (1800, 2500, 1800, 3500));
+  e.insert (db::Edge (1900, 1000, 1900, 2000));
   e.insert (db::Edge (-1500, 0, -1500, 1000));
 
   db::Region r;
   r.insert (db::Box (0, -1000, 2000, 0));
-  r.insert (db::Box (1000, 1000, 2000, 2000));
+  r.insert (db::Box (1000, 1000, 2000, 1500));
+  r.insert (db::Box (1000, 1500, 2000, 2000));
 
-  EXPECT_EQ (db::compare (e.selected_outside (db::Region ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside (db::Region ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_outside (db::Region ()), ""), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (db::Region ()).first, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (db::Region ()).first, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (db::Region ()).second, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside (r), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_not_outside (r), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (r).first, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (r).second, ""), true);
   EXPECT_EQ (db::compare (e.selected_outside (r), "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_not_outside (r), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (r), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (r).first, "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (r).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (r).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500);(1900,1000;1900,2000)"), true);
 }
 
 //  Edges::selected_outside(edges)
@@ -1089,6 +1095,7 @@ TEST(27)
   e.insert (db::Edge (1600, -400, 1600, -200));
   e.insert (db::Edge (1700, 1500, 1600, 2500));
   e.insert (db::Edge (1800, 2500, 1800, 3500));
+  e.insert (db::Edge (1900, 1000, 1900, 2000));
   e.insert (db::Edge (-1500, 0, -1500, 1000));
 
   db::Edges ee;
@@ -1096,21 +1103,22 @@ TEST(27)
     ee.insert (db::Edge (i, -1000, i, 0));
   }
   for (int i = 1000; i <= 2000; i += 100) {
-    ee.insert (db::Edge (i, 1000, i, 2000));
+    ee.insert (db::Edge (i, 1000, i, 1500));
+    ee.insert (db::Edge (i, 1500, i, 2000));
   }
 
-  EXPECT_EQ (db::compare (e.selected_outside (db::Edges ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside (db::Edges ()), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_outside (db::Edges ()), ""), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (db::Edges ()).first, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (db::Edges ()).first, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-400);(1600,-400;1600,-200);(1700,1500;1600,2500);(1800,2500;1800,3500);(1900,1000;1900,2000);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (db::Edges ()).second, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside (ee), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_not_outside (ee), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (ee).first, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (ee).second, ""), true);
   EXPECT_EQ (db::compare (e.selected_outside (ee), "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (ee).first, "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1900,1000;1900,2000)"), true);
 }
 
 //  GitHub issue #72 (Edges/Region NOT issue)