text: #ifndef VOLUMEMEDIUMPROPERTIES_H_
  #define VOLUMEMEDIUMPROPERTIES_H_
  
  /** \class VolumeMediumProperties
   *  Holds constants for estimating material effects in a volume:
   *   x0 = rad. length (in cm; used for estimation of multiple scattering)
   *   xi = rho(g/cm3) *0.307075[MeV/(g/cm2)] * <Z/A> * 1/2
   *                 (used for energy loss acc. to Bethe-Bloch)
   */
  
  class VolumeMediumProperties
  {  
  public:
    VolumeMediumProperties (float x0, float xi) :
      x0_(x0), xi_(xi) {}
  
    // Radiation length (in cm)
    float x0 () const {return x0_;}
    // Scaling factor for energy loss (see class description)
    float xi () const {return xi_;}
  
   private:
    float x0_;
    float xi_;
  };
  
  #endif
  