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    // ********************************************************************
    // * License and Disclaimer                                           *
    // *                                                                  *
    // * The  Geant4 software  is  copyright of the Copyright Holders  of *
    // * the Geant4 Collaboration.  It is provided  under  the terms  and *
    // * conditions of the Geant4 Software License,  included in the file *
    // * LICENSE and available at  http://cern.ch/geant4/license .  These *
    // * include a list of copyright holders.                             *
    // *                                                                  *
    // * Neither the authors of this software system, nor their employing *
    // * institutes,nor the agencies providing financial support for this *
    // * work  make  any representation or  warranty, express or implied, *
    // * regarding  this  software system or assume any liability for its *
    // * use.  Please see the license in the file  LICENSE  and URL above *
    // * for the full disclaimer and the limitation of liability.         *
    // *                                                                  *
    // * This  code  implementation is the result of  the  scientific and *
    // * technical work of the GEANT4 collaboration.                      *
    // * By using,  copying,  modifying or  distributing the software (or *
    // * any work based  on the software)  you  agree  to acknowledge its *
    // * use  in  resulting  scientific  publications,  and indicate your *
    // * acceptance of all terms of the Geant4 Software license.          *
    //
    // @Author Chad Lantz
    
    #ifndef AirHit_h
    #define AirHit_h 1
    
    #include "G4VHit.hh"
    #include "G4THitsCollection.hh"
    #include "G4Allocator.hh"
    #include "G4ThreeVector.hh"
    #include "G4ParticleDefinition.hh"
    
    class AirHit : public G4VHit{
    public:
    
      AirHit();
      ~AirHit();
      AirHit(const AirHit&);
      const AirHit& operator=(const AirHit&);
      G4int operator==(const AirHit&) const;
    
      inline void* operator new(size_t);
      inline void  operator delete(void*);
    
      void Draw();
      void Print();
    
    public:
      void          setTrackID    (G4int track)       { trackID = track; }
      void          setPos        (G4ThreeVector xyz) { pos = xyz; }
      void          setMomentum   (G4ThreeVector mom) { momentum = mom; }
      void          setEnergy     (G4double e)        { energy = e; }
      G4int         getTrackID    ( )                 { return trackID; }
      G4ThreeVector getPos        ( )                 { return pos; }
      G4double      getEnergy     ( )                 { return energy; }
      G4ThreeVector getMomentum   ( )                 { return momentum; }
    
    private:
      G4int         trackID;
      G4ThreeVector pos;
      G4ThreeVector momentum;
      G4double      energy;
      G4double      charge;
    };
    
    
    ///////////////////////// Hit collection definition /////////////////////////
    typedef G4THitsCollection<AirHit> HitsCollection;
    
    extern G4Allocator<AirHit> HitAllocator;
    
    /*
     *
     */
    inline void* AirHit::operator new(size_t)
    {
      void *aHit;
      aHit = (void *) HitAllocator.MallocSingle();
      return aHit;
    }
    
    /*
     *
     */
    inline void AirHit::operator delete(void *aHit)
    {
      HitAllocator.FreeSingle((AirHit*) aHit);
    }
    
    #endif