diff --git a/examples/sprint-pops.latencies b/examples/sprint-pops.latencies
new file mode 100644
index 0000000..7c3fd07
--- /dev/null
+++ b/examples/sprint-pops.latencies
@@ -0,0 +1,84 @@
+0 1 0.312
+2 3 10.786
+1 4 0.222
+1 5 1.035
+1 6 1.414
+1 7 1.24
+1 8 0.814
+1 9 19.532
+1 10 0.352
+1 11 4.593
+12 13 2.622
+14 15 0.207
+14 16 12.098
+14 17 13.941
+15 18 7.791
+15 19 38.946
+20 21 19.775
+20 22 0.345
+23 24 5.337
+25 26 0.276
+27 28 0.645
+8 20 19.787
+8 16 8.352
+8 28 1.578
+8 24 10.459
+8 26 5.005
+21 31 20.741
+13 32 4.737
+13 33 1.424
+17 35 2.091
+17 20 14.409
+17 18 7.13
+17 28 6.214
+17 24 6.437
+17 25 1.315
+17 26 1.176
+17 29 3.282
+17 36 2.478
+11 24 5.751
+11 38 3.235
+11 17 4.718
+33 39 1.817
+33 40 2.035
+6 7 0.327
+6 28 0.97
+6 25 5.176
+6 8 0.612
+6 17 5.725
+6 34 0.802
+6 11 6.007
+39 42 0.699
+16 24 3.655
+16 29 0.135
+16 17 3.286
+31 45 0.268
+31 46 0.268
+31 37 3.375
+31 47 2.708
+32 48 1.712
+32 44 2.329
+32 42 1.595
+48 49 3.201
+7 13 31.13
+38 43 1.643
+9 15 5.513
+9 20 0.437
+9 31 2.648
+9 30 0.124
+9 17 14.774
+9 19 42.03
+5 32 28.338
+5 8 0.359
+5 7 0.316
+18 23 0.779
+40 48 2.34
+40 49 2.529
+24 38 7.706
+24 31 9.827
+24 45 10.045
+24 50 0.092
+3 9 59.812
+19 41 26.19
+19 20 42.057
+19 51 14.125
diff --git a/examples/sprint-pops.weights b/examples/sprint-pops.weights
new file mode 100644
index 0000000..387a37f
--- /dev/null
+++ b/examples/sprint-pops.weights
@@ -0,0 +1,84 @@
+0 1 312
+2 3 10786
+1 4 222
+1 5 2500
+1 6 4000
+1 7 2500
+1 8 3860
+1 9 11769
+1 10 352
+1 11 3500
+12 13 2622
+14 15 500
+14 16 14192
+14 17 8909
+15 18 11747
+15 19 44530
+20 21 19775
+20 22 345
+23 24 5337
+25 26 2184
+27 28 645
+8 20 11409
+8 16 8282
+8 28 3000
+8 24 7735
+8 26 5500
+21 31 20741
+13 32 7552
+13 33 1500
+17 35 2091
+17 20 14409
+17 18 4337
+17 28 4000
+17 24 5735
+17 25 1315
+17 26 2500
+17 29 3282
+17 36 2478
+11 24 5096
+11 38 3235
+11 17 4360
+33 39 2000
+33 40 3000
+6 7 2500
+6 28 6860
+6 25 5176
+6 8 5860
+6 17 3860
+6 34 802
+6 11 5500
+39 42 699
+16 24 1547
+16 29 3000
+16 17 5282
+31 45 500
+31 46 268
+31 37 3375
+31 47 2708
+32 48 1712
+32 44 2329
+32 42 3352
+48 49 3201
+7 13 30890
+38 43 1643
+9 15 5500
+9 20 2500
+9 31 4735
+9 30 124
+9 17 13909
+9 19 42030
+5 32 28338
+5 8 2360
+5 7 2000
+18 23 5735
+40 48 2340
+40 49 2529
+24 38 2860
+24 31 9909
+24 45 10409
+24 50 92
+3 9 59812
+19 41 26190
+19 20 39530
+19 51 14125
diff --git a/examples/sprint-topology.cc b/examples/sprint-topology.cc
index 3a53c35..b3baa7c 100644
--- a/examples/sprint-topology.cc
+++ b/examples/sprint-topology.cc
@@ -35,6 +35,13 @@
 
 NS_LOG_COMPONENT_DEFINE ("CcnxSprintTopology");
 
+void PrintTime ()
+{
+  NS_LOG_INFO (Simulator::Now ());
+
+  Simulator::Schedule (Seconds (1.0), PrintTime);
+}
+
 int 
 main (int argc, char *argv[])
 {
@@ -42,16 +49,20 @@
   // Packet::EnablePrinting();
   string weights ("./src/NDNabstraction/examples/sprint.weights");
   string latencies ("./src/NDNabstraction/examples/sprint.latencies");
+  string positions;
     
   Time finishTime = Seconds (2.0);
   string animationFile;
   string strategy = "ns3::CcnxFloodingStrategy";
+  string save;
   CommandLine cmd;
   cmd.AddValue ("finish", "Finish time", finishTime);
   cmd.AddValue ("netanim", "NetAnim filename", animationFile);
   cmd.AddValue ("strategy", "CCNx forwarding strategy", strategy);
   cmd.AddValue ("weights", "Weights file", weights);
   cmd.AddValue ("latencies", "Latencies file", latencies);
+  cmd.AddValue ("positions", "Positions files", positions);
+  cmd.AddValue ("save", "Save positions to a file", save);
   cmd.Parse (argc, argv);
 
   // ------------------------------------------------------------
@@ -61,9 +72,16 @@
   RocketfuelWeightsReader reader ("/sprint");
   reader.SetBoundingBox (0, 0, 400, 250);
 
+  if (!positions.empty())
+    {
+      reader.SetFileName (positions);
+      reader.SetFileType (RocketfuelWeightsReader::POSITIONS);
+      reader.Read ();
+    }
+  
   reader.SetFileName (weights);
   reader.SetFileType (RocketfuelWeightsReader::WEIGHTS);    
-  NodeContainer nodes = reader.Read ();
+  reader.Read ();
 
   reader.SetFileName (latencies);
   reader.SetFileType (RocketfuelWeightsReader::LATENCIES);    
@@ -76,13 +94,13 @@
       return -1;
     }
     
-  NS_LOG_INFO("Nodes = " << nodes.GetN());
+  NS_LOG_INFO("Nodes = " << reader.GetNodes ().GetN());
   NS_LOG_INFO("Links = " << reader.LinksSize ());
     
   InternetStackHelper stack;
   Ipv4GlobalRoutingHelper ipv4RoutingHelper ("ns3::Ipv4GlobalRoutingOrderedNexthops");
   stack.SetRoutingHelper (ipv4RoutingHelper);
-  stack.Install (nodes);
+  stack.Install (reader.GetNodes ());
 
   reader.AssignIpv4Addresses (Ipv4Address ("10.0.0.0"));
 
@@ -98,14 +116,21 @@
   // ccnxHelper.InstallFakeGlobalRoutes ();
   // ccnxHelper.InstallRouteTo (Names::Find<Node> ("/sprint", "San+Jose,+CA4062"));
 
-  // Simulator::Schedule (Seconds (1.0), PrintFIBs);
-  // PrintFIBs ();
-
   Simulator::Stop (finishTime);
+  Simulator::Schedule (Seconds (1.0), PrintTime);
+
+  // reader.SavePositions (save+".debug");
 
   NS_LOG_INFO ("Run Simulation.");
   Simulator::Run ();
   Simulator::Destroy ();
   NS_LOG_INFO ("Done.");
+
+  if (!save.empty ())
+    {
+      NS_LOG_INFO ("Saving positions.");
+      reader.SavePositions (save);
+    }
+  
   return 0;
 }