diff --git a/tracking/central_electrons.sh b/tracking/central_electrons.sh
index 61a81c4c3f3398b4768232ead83a9415dfefe63f..0593a2a6e3c52c2811c897eadbe10d505b896add 100644
--- a/tracking/central_electrons.sh
+++ b/tracking/central_electrons.sh
@@ -22,7 +22,7 @@ echo "JUGGLER_N_EVENTS = ${JUGGLER_N_EVENTS}"
 echo "JUGGLER_DETECTOR = ${JUGGLER_DETECTOR}"
 
 
-## Build the detector constructors.
+### Build the detector constructors.
 git clone https://eicweb.phy.anl.gov/EIC/detectors/${JUGGLER_DETECTOR}.git
 mkdir ${JUGGLER_DETECTOR}/build
 pushd ${JUGGLER_DETECTOR}/build
@@ -52,7 +52,6 @@ if [[ "$?" -ne "0" ]] ; then
   exit 1
 fi
 
-
 # Need to figure out how to pass file name to juggler from the commandline
 xenv -x ${JUGGLER_INSTALL_PREFIX}/Juggler.xenv gaudirun.py ../tracking/options/tracker_reconstruction.py
 
@@ -67,6 +66,10 @@ pwd
 mkdir -p results/tracking
 
 root -b -q "tracking/scripts/rec_central_electrons.cxx(\"${JUGGLER_DETECTOR}/${JUGGLER_REC_FILE}\")"
+if [[ "$?" -ne "0" ]] ; then
+  echo "ERROR running juggler"
+  exit 1
+fi
 
 if [[ "${JUGGLER_N_EVENTS}" -lt "500" ]] ; then 
 cp ${JUGGLER_DETECTOR}/${JUGGLER_REC_FILE} results/.
diff --git a/tracking/options/tracker_reconstruction.py b/tracking/options/tracker_reconstruction.py
index 1fec0a4afc6b908606ef7441c484a2976cbb744a..52c86afc82dafa23a543b8feb7f5b0e19752855c 100644
--- a/tracking/options/tracker_reconstruction.py
+++ b/tracking/options/tracker_reconstruction.py
@@ -100,6 +100,13 @@ trk_find_alg1 = TrackFindingAlgorithm("trk_find_alg1",
 parts_from_fit = ParticlesFromTrackFit("parts_from_fit",
         inputTrajectories="trajectories",
         outputParticles="ReconstructedParticles",
+        outputTrackParameters="outputTrackParameters",
+        OutputLevel=DEBUG)
+
+parts_from_fit1 = ParticlesFromTrackFit("parts_from_fit1",
+        inputTrajectories="trajectories1",
+        outputParticles="ReconstructedParticles1",
+        outputTrackParameters="outputTrackParameters1",
         OutputLevel=DEBUG)
 
 #types = []
@@ -139,8 +146,9 @@ ApplicationMgr(
               sourcelinker, 
               cluster_init, trackpartruth, 
               trk_find_alg, 
-              #trk_find_alg1,
+              trk_find_alg1,
               parts_from_fit,
+              parts_from_fit1,
               out
               ],
     EvtSel = 'NONE',
diff --git a/tracking/scripts/rec_central_electrons.cxx b/tracking/scripts/rec_central_electrons.cxx
index 01413ab5b1695f4a9f3bd7ad638a077ec571d2c6..e8746cfbacae7f0f09090fcaf8e045a01004a991 100644
--- a/tracking/scripts/rec_central_electrons.cxx
+++ b/tracking/scripts/rec_central_electrons.cxx
@@ -93,6 +93,7 @@ int rec_central_electrons(const char* fname = "topside/rec_central_electrons.roo
                  .Define("p_thrown", momentum, {"thrownP"})
                  .Define("nTracks", "outputTrackParameters.size()")
                  .Define("p_track", p_track, {"outputTrackParameters"})
+                 .Define("p_track1", p_track, {"outputTrackParameters1"})
                  .Define("delta_p",
                          [](const std::vector<double>& tracks,
                             const std::vector<double>& thrown) {
@@ -104,11 +105,24 @@ int rec_central_electrons(const char* fname = "topside/rec_central_electrons.roo
                            }
                            return res;
                          },
-                         {"p_track", "p_thrown"});
+                         {"p_track", "p_thrown"})
+                 .Define("delta_p1",
+                         [](const std::vector<double>& tracks,
+                            const std::vector<double>& thrown) {
+                           std::vector<double> res;
+                           for (const auto &p1 : thrown) {
+                             for (const auto &p2 : tracks) {
+                               res.push_back(p1 - p2);
+                             }
+                           }
+                           return res;
+                         },
+                         {"p_track1", "p_thrown"});
 
   auto h_nTracks = df0.Histo1D({"h_nTracks", "; N tracks ", 10, 0, 10}, "nTracks");
   auto h_pTracks = df0.Histo1D({"h_pTracks", "; GeV/c ", 100, 0, 10}, "p_track");
   auto h_delta_p = df0.Histo1D({"h_delta_p", "; GeV/c ", 100, -10, 10}, "delta_p");
+  auto h_delta_p1 = df0.Histo1D({"h_delta_p1", "; GeV/c ", 100, -10, 10}, "delta_p1");
 
   auto c = new TCanvas();
 
@@ -121,6 +135,8 @@ int rec_central_electrons(const char* fname = "topside/rec_central_electrons.roo
   c->SaveAs("results/tracking/rec_central_electrons_pTracks.pdf");
 
   h_delta_p->DrawCopy();
+  h_delta_p1->SetLineColor(2);
+  h_delta_p1->DrawCopy("same");
   c->SaveAs("results/tracking/rec_central_electrons_delta_p.png");
   c->SaveAs("results/tracking/rec_central_electrons_delta_p.pdf");