this is the result I just got, I don't see any problem here. How do you sort your data? yuxuan <table width=100%> <tr valign=top> <td> <td>j.hartmann@dkfz-heidelberg.de Sent by: gate-users-bounces@lists.healthgrid.org 03/02/2007 11:17 AM <td>                To:        Gate users <gate-users@lists.healthgrid.org>         cc:                 Subject:        [Gate-users] counting rates again</table> <tt>Hello again! You are right, I should have sent the details straight away, here the macro of the full simulation: # #                 V I S U A L I S A T I O N # /vis/open OGLSX /vis/viewer/reset /vis/drawView 0 90 #/vis/viewer/zoom 4 /vis/viewer/set/style surface /vis/drawVolume /tracking/storeTrajectory 1 /vis/scene/endOfEventAction accumulate /vis/viewer/update /gate/geometry/enableAutoUpdate # #     W O R L D # /gate/world/geometry/setXLength 81. cm /gate/world/geometry/setYLength 81. cm /gate/world/geometry/setZLength 81. cm #     D E F I N I T I O N  O F  T H E  S Y S T E M # #     C Y L I N D R I C A L /gate/world/daughters/name cylindricalPET /gate/world/daughters/insert cylinder /gate/cylindricalPET/setMaterial Vacuum /gate/cylindricalPET/geometry/setRmax 40 cm /gate/cylindricalPET/geometry/setRmin 33 cm /gate/cylindricalPET/geometry/setHeight 22 cm /gate/cylindricalPET/vis/forceWireframe # #     H E A D # /gate/cylindricalPET/daughters/name rsector /gate/cylindricalPET/daughters/insert box /gate/rsector/placement/setTranslation 0 35.5  0 cm /gate/rsector/geometry/setXLength 21.12 cm /gate/rsector/geometry/setYLength 1. cm /gate/rsector/geometry/setZLength 0.33 cm /gate/rsector/setMaterial TiO2 /gate/rsector/vis/forceWireframe # #                 C R Y S T A L # /gate/rsector/daughters/name crystal /gate/rsector/daughters/insert box /gate/crystal/geometry/setXLength 3.1 mm /gate/crystal/geometry/setYLength 10. mm /gate/crystal/geometry/setZLength 3.1 mm /gate/crystal/setMaterial LSO /gate/crystal/vis/forceWireframe #                 R E P E A T    C R Y S T A L   /gate/crystal/repeaters/insert cubicArray /gate/crystal/cubicArray/setRepeatNumberX 64 /gate/crystal/cubicArray/setRepeatNumberY 1 /gate/crystal/cubicArray/setRepeatNumberZ 1 /gate/crystal/cubicArray/setRepeatVector 3.3 0 0 mm #                 R E P E A T   H E A D /gate/rsector/repeaters/insert ring /gate/rsector/ring/setRepeatNumber 2 #                 A T T A C H    S Y S T E M /gate/systems/cylindricalPET/rsector/attach rsector /gate/systems/cylindricalPET/module/attach crystal # #                 M O V E M E N T S   O F   T H E   C A M E R A # /gate/cylindricalPET/moves/insert orbiting /gate/cylindricalPET/orbiting/setSpeed 0.2 deg/s /gate/cylindricalPET/orbiting/setPoint1 0 0 0 cm /gate/cylindricalPET/orbiting/setPoint2 0 0 1 cm #     D E F I N I T I O N  O F  T H E   P H Y S I C S                       # #       EM  P R O C E S S /gate/physics/gamma/selectRayleigh lowenergy /gate/physics/gamma/selectPhotoelectric standard /gate/physics/gamma/selectCompton standard #                 I N A C T I V E    S E C O N D A R Y   E L E C T R O N S /gate/physics/setElectronCut 1. m #                 I N A C T I V E    X - R A Y S /gate/physics/setXRayCut 1. GeV /gate/physics/setDeltaRayCut 1. GeV </tt> <tt>#     I N I T I A L I Z A T I O N   /gate/geometry/enableAutoUpdate /run/initialize #                                                                 # #  D E F I N I T I O N   O F   T H E   A C Q U I S I T I O N    # #  D I G I T I Z E R   &   C O I N C I D E N C E   S O R T E R  # #                                                                 # #                 A D D E R /gate/digitizer/Singles/insert adder #       R E A D O U T /gate/digitizer/Singles/insert readout /gate/digitizer/Singles/readout/setDepth 2 #      E N E R G Y   B L U R R I N G /gate/digitizer/Singles/insert blurring /gate/digitizer/Singles/blurring/setResolution 0.26 /gate/digitizer/Singles/blurring/setEnergyOfReference 511. keV #                 C O I N C I D E N C E    S O R T E R /gate/digitizer/Coincidences/minSectorDifference 1 /gate/digitizer/Coincidences/setWindow 10. ns /gate/digitizer/Coincidences/setDepth 2 #        D E F I N I T I O N   O F                     # #                T H E   O U T P U T   F I L E         # #                                                       # #       C H A N G E    T H E     S E E D (1)  O R   N O T (0) /gate/output/root/setSaveRndmFlag 1 #       S E T U P  - R O O T _ F I L E /gate/output/root/setFileName Your_PET_Simu /gate/output/root/setRootSinglesAdderFlag 1 /gate/output/root/setRootSinglesReadoutFlag 1 /gate/output/root/setRootHitFlag 1 /gate/output/root/setRootSinglesFlag 1 /gate/output/root/setRootNtupleFlag 1 /gate/output/root/setRootCoincidencesFlag 1 #       S E T U P  - A S C I I _ F I L E /gate/output/ascii/setOutFileSinglesAdderFlag 1 /gate/output/ascii/setOutFileSinglesReadoutFlag 1 #/gate/output/ascii/setOutFileSinglesThresholderFlag 0 #/gate/output/ascii/setOutFileSinglesUpholderFlag 0 /gate/output/ascii/setOutFileSinglesFlag 0 /gate/output/ascii/setOutFileHitsFlag 0 /gate/output/ascii/setOutFileCoincidencesFlag 1 /gate/output/ascii/setOutFileSizeLimit 200000000 /gate/output/ascii/setCoincidenceMask 1 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 #                                                                 # #      D E F I N I T I O N   O F  V E R B O S I T Y   L E V E L   # #                                                                 # /control/verbose 0 /grdm/verbose 0 /run/verbose 0 /event/verbose 0 /tracking/verbose 0 /gate/application/verbose 0 /gate/generator/verbose 0 /gate/stacking/verbose 0 /gate/event/verbose 0 /gate/source/verbose 0 #                                                                 # #          D E F I N I T I O N   O F  T H E   S O U R C E         # ##### simple particle source twogamma backtoback /gate/source/addSource 2gamma1 /gate/source/2gamma1/gps/particle gamma /gate/source/2gamma1/setType backtoback /gate/source/2gamma1/setActivity 5000. becquerel /gate/source/2gamma1/gps/energytype Mono /gate/source/2gamma1/gps/monoenergy 511 keV /gate/source/2gamma1/gps/angtype iso /gate/source/2gamma1/gps/mintheta 90 deg /gate/source/2gamma1/gps/maxtheta 90. deg /gate/source/2gamma1/gps/minphi 0. deg /gate/source/2gamma1/gps/maxphi 360. deg /gate/source/2gamma1/gps/type Plane /gate/source/2gamma1/gps/shape Circle /gate/source/2gamma1/gps/radius 1 cm #### placement of the source /gate/source/2gamma1/gps/centre 0 0 0 cm /gate/source/2gamma1/gps/confine NULL #                                                                      # #    S T A R T   A C Q U I S I T I O N  T I M E   P A R A M E T E R S  # #                                                                      # /gate/application/setTimeSlice     5.  s /gate/application/setTimeStart     0.   s /gate/application/setTimeStop      900.  s /gate/application/startDAQ _______________________________________________ Gate-users mailing list Gate-users@lists.healthgrid.org http://lists.healthgrid.org/mailman/listinfo/gate-users </tt>