[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // $Id: G4PolarizedPEEffectModel.cc,v 1.1 2007/11/01 17:29:09 schaelic Exp $ |
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[1228] | 27 | // GEANT4 tag $Name: geant4-09-03 $ |
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[819] | 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // |
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| 31 | // GEANT4 Class file |
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| 32 | // |
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| 33 | // |
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| 34 | // File name: G4PolarizedPEEffectModel |
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| 35 | // |
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| 36 | // Author: Andreas Schaelicke & Karim Laihem |
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| 37 | // |
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| 38 | // Creation date: 22.02.2007 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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| 42 | // Class Description: |
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| 43 | // |
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| 44 | // Implementation of Photo electric effect |
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| 45 | // including polarization transfer from circularly polarised gammas |
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| 46 | |
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| 47 | // ------------------------------------------------------------------- |
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| 48 | // |
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| 49 | |
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| 50 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 51 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 52 | |
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| 53 | #ifndef NOIONIZATIONAS |
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| 54 | |
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| 55 | #include "G4PolarizedPEEffectModel.hh" |
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| 56 | #include "G4Electron.hh" |
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| 57 | #include "G4Positron.hh" |
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| 58 | #include "G4Gamma.hh" |
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| 59 | #include "Randomize.hh" |
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| 60 | #include "G4DataVector.hh" |
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| 61 | #include "G4PhysicsLogVector.hh" |
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| 62 | #include "G4ParticleChangeForGamma.hh" |
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| 63 | #include "G4PolarizedPEEffectCrossSection.hh" |
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| 64 | #include "G4PolarizationHelper.hh" |
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| 65 | |
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| 66 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 67 | |
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| 68 | |
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| 69 | G4PolarizedPEEffectModel::G4PolarizedPEEffectModel(const G4ParticleDefinition* pd, |
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| 70 | const G4String& nam) |
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| 71 | : G4PEEffectModel(pd,nam),crossSectionCalculator(0) |
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| 72 | { |
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| 73 | } |
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| 74 | |
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| 75 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 76 | |
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| 77 | G4PolarizedPEEffectModel::~G4PolarizedPEEffectModel() |
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| 78 | { |
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| 79 | if (crossSectionCalculator) delete crossSectionCalculator; |
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| 80 | } |
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| 81 | |
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| 82 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 83 | |
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| 84 | void G4PolarizedPEEffectModel::Initialise(const G4ParticleDefinition* pd, |
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| 85 | const G4DataVector& dv) |
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| 86 | { |
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| 87 | G4PEEffectModel::Initialise(pd,dv); |
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| 88 | if (!crossSectionCalculator) |
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| 89 | crossSectionCalculator = new G4PolarizedPEEffectCrossSection(); |
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| 90 | } |
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| 91 | |
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| 92 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 93 | |
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| 94 | void G4PolarizedPEEffectModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp, |
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| 95 | const G4MaterialCutsCouple* couple, |
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| 96 | const G4DynamicParticle* dp, |
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| 97 | G4double tmin, |
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| 98 | G4double maxEnergy) |
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| 99 | { |
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| 100 | // std::vector<G4DynamicParticle*>* vdp = |
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| 101 | G4PEEffectModel::SampleSecondaries(vdp,couple, dp, tmin, maxEnergy); |
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| 102 | |
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| 103 | if(vdp && vdp->size()>0) { |
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| 104 | G4double gamEnergy0 = dp->GetKineticEnergy(); |
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| 105 | G4double lepEnergy1 = (*vdp)[0]->GetKineticEnergy(); |
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| 106 | G4double sintheta = dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag(); |
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| 107 | if (sintheta>1.) sintheta=1.; |
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| 108 | |
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| 109 | G4StokesVector beamPol = dp->GetPolarization(); |
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| 110 | beamPol.SetPhoton(); |
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| 111 | // G4cout<<" beamPol "<<beamPol<<G4endl; |
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| 112 | |
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| 113 | // determine interaction plane |
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| 114 | G4ThreeVector nInteractionFrame = |
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| 115 | G4PolarizationHelper::GetFrame(dp->GetMomentumDirection(), |
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| 116 | (*vdp)[0]->GetMomentumDirection()); |
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| 117 | // G4cout<<" nInteractionFrame = "<<nInteractionFrame<<G4endl; |
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| 118 | if (dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag()<1.e-10) { |
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| 119 | // G4cout<<" nInteractionFrame not well defined "<<G4endl; |
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| 120 | // G4cout<<" choosing random interaction frame "<<G4endl; |
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| 121 | |
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| 122 | nInteractionFrame = G4PolarizationHelper::GetRandomFrame(dp->GetMomentumDirection()); |
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| 123 | // G4cout<<"new nInteractionFrame = "<<nInteractionFrame<<G4endl; |
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| 124 | } |
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| 125 | /* |
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| 126 | else { |
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| 127 | G4ThreeVector mom1=dp->GetMomentumDirection(); |
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| 128 | G4ThreeVector mom2=(*vdp)[0]->GetMomentumDirection(); |
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| 129 | G4cout<<" mom1 = "<<mom1<<G4endl; |
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| 130 | G4cout<<" mom2 = "<<mom2<<G4endl; |
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| 131 | G4ThreeVector x=mom1.cross(mom2); |
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| 132 | G4cout<<" mom1 x mom2 = "<<x<<" "<<x.mag()<<G4endl; |
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| 133 | G4cout<<" norm = "<<(1./x.mag()*x)<<" "<<G4endl; |
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| 134 | } |
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| 135 | */ |
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| 136 | |
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| 137 | // transform polarization into interaction frame |
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| 138 | beamPol.InvRotateAz(nInteractionFrame,dp->GetMomentumDirection()); |
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| 139 | |
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| 140 | // calulcate polarization transfer |
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| 141 | crossSectionCalculator->SetMaterial(GetCurrentElement()->GetN(), // number of nucleons |
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| 142 | GetCurrentElement()->GetZ(), |
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| 143 | GetCurrentElement()->GetfCoulomb()); |
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| 144 | crossSectionCalculator->Initialize(gamEnergy0, lepEnergy1, sintheta, |
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| 145 | beamPol, G4StokesVector::ZERO); |
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| 146 | |
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| 147 | // deterimine final state polarization |
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| 148 | G4StokesVector lep1Pol = crossSectionCalculator->GetPol2(); |
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| 149 | // G4cout<<" lepPol "<<lep1Pol<<G4endl; |
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| 150 | lep1Pol.RotateAz(nInteractionFrame,(*vdp)[0]->GetMomentumDirection()); |
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| 151 | (*vdp)[0]->SetPolarization(lep1Pol.p1(), |
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| 152 | lep1Pol.p2(), |
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| 153 | lep1Pol.p3()); |
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| 154 | |
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| 155 | // G4cout<<" lepPol "<<lep1Pol<<G4endl; |
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| 156 | size_t num = vdp->size(); |
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| 157 | if (num!=1) G4cout<<" WARNING "<<num<<" secondaries in polarized photo electric effect not supported!\n"; |
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| 158 | } |
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| 159 | } |
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| 160 | |
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| 161 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 162 | #endif //NOIONIZATIONAS |
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