diff --git a/FCCSW_ecal/run_thetamodulemerged.py b/FCCSW_ecal/run_thetamodulemerged.py
index b86aecd..50dada6 100644
--- a/FCCSW_ecal/run_thetamodulemerged.py
+++ b/FCCSW_ecal/run_thetamodulemerged.py
@@ -55,7 +55,6 @@
 # python libraries
 import os
 from math import cos, sin, tan
-
 #
 # SETTINGS
 #
@@ -63,7 +62,7 @@
 # - general settings
 #
 use_pythia = False  # use pythia or particle gun
-addNoise = False     # add noise or not to the cell energy
+addNoise = True     # add noise or not to the cell energy
 dumpGDML = False    # create GDML file of detector model
 runHCal = False     # simulate only the ECAL or both ECAL+HCAL
 
@@ -367,7 +366,8 @@
 
 # Step 1: merge hits into cells according to initial segmentation
 ecalBarrelCellsName = "ECalBarrelCells"
-createEcalBarrelCells = CreateCaloCells("CreateECalBarrelCells",
+if not addNoise:
+    createEcalBarrelCells = CreateCaloCells("CreateECalBarrelCells",
                                         doCellCalibration=True,
                                         calibTool=calibEcalBarrel,
                                         addCellNoise=False,
@@ -432,7 +432,6 @@
 createEcalBarrelPositionedCells2.hits.Path = ecalBarrelCellsName2
 createEcalBarrelPositionedCells2.positionedHits.Path = "ECalBarrelPositionedCells2"
 
-
 # Create cells in ECal endcap
 createEcalEndcapCells = CreateCaloCells("CreateEcalEndcapCaloCells",
                                         doCellCalibration=True,
@@ -458,28 +457,30 @@
                                                     filterNoiseThreshold=0,
                                                     numRadialLayers=11,
                                                     scaleFactor=1 / 1000.,  # MeV to GeV
-                                                    OutputLevel=DEBUG)
-
-    # needs to be migrated!
-    #from Configurables import TubeLayerPhiEtaCaloTool
-    #barrelGeometry = TubeLayerPhiEtaCaloTool("EcalBarrelGeo",
-    #                                         readoutName=ecalBarrelReadoutNamePhiEta,
-    #                                         activeVolumeName="LAr_sensitive",
-    #                                         activeFieldName="layer",
-    #                                         activeVolumesNumber=12,
-    #                                         fieldNames=["system"],
-    #                                         fieldValues=[4])
+                                                    OutputLevel=INFO)
+
+    # barrel geometry tool is migrated to match ALLEGRO v3 segmentation
+    from Configurables import TubeLayerModuleThetaMergedCaloTool
+    barrelGeometry = TubeLayerModuleThetaMergedCaloTool("EcalBarrelGeo",
+                                             readoutName=ecalBarrelReadoutName,
+                                             activeVolumeName="LAr_sensitive",
+                                             activeFieldName="layer",
+                                             activeVolumesNumber=11,
+                                             fieldNames=["system"],
+                                             fieldValues=[4])
     
     # cells with noise not filtered
-    # createEcalBarrelCellsNoise = CreateCaloCells("CreateECalBarrelCellsNoise",
-    #                                              doCellCalibration=False,
-    #                                              addCellNoise=True,
-    #                                              filterCellNoise=False,
-    #                                              OutputLevel=INFO,
-    #                                              hits="ECalBarrelCellsStep2",
-    #                                              noiseTool=noiseBarrel,
-    #                                              geometryTool=barrelGeometry,
-    #                                              cells=EcalBarrelCellsName)
+    createEcalBarrelCells = CreateCaloCells("CreateECalBarrelCellsNoise",
+                                                 doCellCalibration=True,
+                                                 calibTool=calibEcalBarrel,
+                                                 addCellNoise=True,
+                                                 filterCellNoise=False,
+                                                 noiseTool=noiseBarrel,
+                                                 addPosition=True,
+                                                 geometryTool=barrelGeometry,
+                                                 OutputLevel=INFO,
+                                                 hits=ecalBarrelHitsName,
+                                                 cells=ecalBarrelCellsName)
 
     # cells with noise filtered
     # createEcalBarrelCellsNoise = CreateCaloCells("CreateECalBarrelCellsNoise_filtered",
@@ -864,7 +865,7 @@
     resegmentEcalBarrel,
     createEcalBarrelCells2,
     createEcalBarrelPositionedCells2,
-    createEcalEndcapCells
+    createEcalEndcapCells,
 ]
 
 if runHCal:
diff --git a/FCCSW_ecal/xtalk_neighbours_theta.py b/FCCSW_ecal/xtalk_neighbours_theta.py
new file mode 100644
index 0000000..3f9d7af
--- /dev/null
+++ b/FCCSW_ecal/xtalk_neighbours_theta.py
@@ -0,0 +1,37 @@
+from Configurables import GeoSvc
+from Configurables import ApplicationMgr
+from Configurables import CreateFCCeeCaloXTalkNeighbours
+import os
+from Gaudi.Configuration import INFO, DEBUG
+
+# Detector geometry
+geoservice = GeoSvc("GeoSvc")
+# if K4GEO is empty, this should use relative path to working directory
+path_to_detector = os.environ.get("K4GEO", "")
+print(path_to_detector)
+detectors_to_use = [
+    'FCCee/ALLEGRO/compact/ALLEGRO_o1_v02/ALLEGRO_o1_v02.xml'
+]
+
+# prefix all xmls with path_to_detector
+geoservice.detectors = [os.path.join(path_to_detector, _det) for _det in detectors_to_use]
+geoservice.OutputLevel = INFO
+
+# create the crosstalk neighbour file for ECAL barrel cells
+neighbours = CreateFCCeeCaloXTalkNeighbours("xtalk_neighbours",
+                                       outputFileName="xtalk_neighbours_map_ecalB_thetamodulemerged.root",
+                                       readoutNames=["ECalBarrelModuleThetaMerged"],
+                                       systemNames=["system"],
+                                       systemValues=[4],
+                                       activeFieldNames=["layer"],
+                                       activeVolumesNumbers=[12],
+                                       OutputLevel=DEBUG)
+
+# ApplicationMgr
+ApplicationMgr(TopAlg=[],
+               EvtSel='NONE',
+               EvtMax=1,
+               # order is important, as GeoSvc is needed by G4SimSvc
+               ExtSvc=[geoservice, neighbours],
+               OutputLevel=INFO
+               )
diff --git a/README.md b/README.md
index 42c0eed..224cef4 100644
--- a/README.md
+++ b/README.md
@@ -266,3 +266,13 @@ Basically runs all the steps in one go. Comment/uncomment lines as needed.
 * Calls the `runParallel` scripts for the various steps.
 * Train the MVA calib (on CaloClusters and CaloTopoClusters)
 * Then compute the resolutions and responses, and make plots.
+
+#### Producing neighbours of crosstalk
+jobOption to run:
+`xtalk_neighbours_theta.py`
+
+For each cell, generate a list of crosstalk neighbours and their corresponding crosstalk coefficients with respect to the cell under study. The Layer/Module/Theta indices can be added for debug purpose.
+
+Output:
+`xtalk_neighbours_map_ecalB_thetamodulemerged.root`
+A list of crosstalk neighbours and corresponding crosstalk coefficients for each cell.