35using CLHEP::c_squared;
37using CLHEP::hbar_Planck;
39using CLHEP::hbarc_squared;
40using CLHEP::electron_charge;
41using CLHEP::e_squared;
42using CLHEP::electron_mass_c2;
43using CLHEP::proton_mass_c2;
44using CLHEP::neutron_mass_c2;
49using CLHEP::elm_coupling;
50using CLHEP::fine_structure_const;
51using CLHEP::classic_electr_radius;
52using CLHEP::electron_Compton_length;
53using CLHEP::Bohr_radius;
54using CLHEP::alpha_rcl2;
55using CLHEP::twopi_mc2_rcl2;
56using CLHEP::k_Boltzmann;
57using CLHEP::STP_Temperature;
58using CLHEP::STP_Pressure;
59using CLHEP::kGasThreshold;
60using CLHEP::universe_mean_density;