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#ifndef RIVET_MATH_UNITS
#define RIVET_MATH_UNITS

#include "Rivet/Math/MathHeader.hh"

namespace Rivet {

  //
  // Length [L]
  //
  static const double millimeter  = 1.;
  static const double millimeter2 = millimeter*millimeter;
  static const double millimeter3 = millimeter*millimeter*millimeter;

  static const double centimeter  = 10.*millimeter;
  static const double centimeter2 = centimeter*centimeter;
  static const double centimeter3 = centimeter*centimeter*centimeter;

  static const double meter  = 1000.*millimeter;
  static const double meter2 = meter*meter;
  static const double meter3 = meter*meter*meter;

  static const double kilometer = 1000.*meter;
  static const double kilometer2 = kilometer*kilometer;
  static const double kilometer3 = kilometer*kilometer*kilometer;

  static const double parsec = 3.0856775807e+16*meter;

  static const double micrometer = 1.e-6 *meter;
  static const double nanometer  = 1.e-9 *meter;
  static const double angstrom   = 1.e-10*meter;
  static const double picometer  = 1.e-12*meter;
  static const double femtometer = 1.e-15*meter;
  static const double attometer  = 1.e-18*meter;
  static const double fermi      = femtometer;

  // symbols
  static const double mm  = millimeter;
  static const double mm2 = millimeter2;
  static const double mm3 = millimeter3;

  static const double cm  = centimeter;
  static const double cm2 = centimeter2;
  static const double cm3 = centimeter3;

  static const double m  = meter;
  static const double m2 = meter2;
  static const double m3 = meter3;

  static const double km  = kilometer;
  static const double km2 = kilometer2;
  static const double km3 = kilometer3;

  static const double pc = parsec;


  // static const double barn = 1.e-28*meter2;
  // Barn-units in terms of the pb returned by AGILe
  static const double  picobarn = 1.0;
  static const double      barn = 1.0e+12* picobarn;
  static const double millibarn = 1.0e-3 * barn;
  static const double microbarn = 1.0e-6 * barn;
  static const double  nanobarn = 1.0e-9 * barn;
  static const double femtobarn = 1.0e-15 * barn;
  static const double attobarn  = 1.0e-18 * barn;

  //
  // Angle
  //
  static const double radian      = 1.;
  static const double milliradian = 1.e-3*radian;
  static const double degree = (3.14159265358979323846/180.0)*radian;
  static const double steradian = 1.;

  // symbols
  static const double rad  = radian;	
  static const double mrad = milliradian;
  static const double sr   = steradian;
  static const double deg  = degree;

  //
  // Time [T]
  //
  static const double nanosecond  = 1.0;
  static const double second      = 1.e+9 *nanosecond;
  static const double millisecond = 1.e-3 *second;
  static const double microsecond = 1.e-6 *second;
  static const double  picosecond = 1.e-12*second;

  static const double hertz = 1.0/second;
  static const double kilohertz = 1.e+3*hertz;
  static const double megahertz = 1.e+6*hertz;

  // symbols
  static const double ns = nanosecond;			
  static const double  s = second;
  static const double ms = millisecond;

  //
  // Electric charge [Q]
  //
  static const double eplus = 1.0;		// positron charge
  static const double e_SI  = 1.60217733e-19;	// positron charge in coulomb
  static const double coulomb = eplus/e_SI;	// coulomb = 6.24150 e+18 * eplus

  //
  // Energy [E]
  //
  static const double gigaelectronvolt = 1.;
  static const double     electronvolt = 1.e-9*gigaelectronvolt;
  static const double kiloelectronvolt = 1.e-6*gigaelectronvolt;
  static const double megaelectronvolt = 1.e-3*gigaelectronvolt;
  static const double teraelectronvolt = 1.e+3*gigaelectronvolt;
  static const double petaelectronvolt = 1.e+6*gigaelectronvolt;
  static const double joule = electronvolt/e_SI;	// joule = 6.24150 e+12 * MeV

  // symbols
  static const double  eV = electronvolt;
  static const double keV = kiloelectronvolt;
  static const double MeV = megaelectronvolt;
  static const double GeV = gigaelectronvolt;
  static const double TeV = teraelectronvolt;
  static const double PeV = petaelectronvolt;

  static const double  eV2 = eV*eV;
  static const double keV2 = keV*keV;
  static const double MeV2 = MeV*MeV;
  static const double GeV2 = GeV*GeV;
  static const double TeV2 = TeV*TeV;
  static const double PeV2 = PeV*PeV;

  //
  // Mass [E][T^2][L^-2]
  //
  static const double  kilogram = joule*second*second/(meter*meter);
  static const double      gram = 1.e-3*kilogram;
  static const double milligram = 1.e-3*gram;

  // symbols
  static const double  kg = kilogram;
  static const double   g = gram;
  static const double  mg = milligram;

  //
  // Power [E][T^-1]
  //
  static const double watt = joule/second;	// watt = 6.24150 e+3 * MeV/ns

  //
  // Force [E][L^-1]
  //
  static const double newton = joule/meter;	// newton = 6.24150 e+9 * MeV/mm

  //
  // Pressure [E][L^-3]
  //
  #define pascal hep_pascal                          // a trick to avoid warnings
  static const double hep_pascal = newton/m2;	   // pascal = 6.24150 e+3 * MeV/mm3
  static const double bar        = 100000*pascal; // bar    = 6.24150 e+8 * MeV/mm3
  static const double atmosphere = 101325*pascal; // atm    = 6.32420 e+8 * MeV/mm3

  //
  // Electric current [Q][T^-1]
  //
  static const double      ampere = coulomb/second; // ampere = 6.24150 e+9 * eplus/ns
  static const double milliampere = 1.e-3*ampere;
  static const double microampere = 1.e-6*ampere;
  static const double  nanoampere = 1.e-9*ampere;

  //
  // Electric potential [E][Q^-1]
  //
  static const double megavolt = megaelectronvolt/eplus;
  static const double kilovolt = 1.e-3*megavolt;
  static const double     volt = 1.e-6*megavolt;

  //
  // Electric resistance [E][T][Q^-2]
  //
  static const double ohm = volt/ampere;	// ohm = 1.60217e-16*(MeV/eplus)/(eplus/ns)

  //
  // Electric capacitance [Q^2][E^-1]
  //
  static const double farad = coulomb/volt;	// farad = 6.24150e+24 * eplus/Megavolt
  static const double millifarad = 1.e-3*farad;
  static const double microfarad = 1.e-6*farad;
  static const double  nanofarad = 1.e-9*farad;
  static const double  picofarad = 1.e-12*farad;

  //
  // Magnetic Flux [T][E][Q^-1]
  //
  static const double weber = volt*second;	// weber = 1000*megavolt*ns

  //
  // Magnetic Field [T][E][Q^-1][L^-2]
  //
  static const double tesla     = volt*second/meter2;	// tesla =0.001*megavolt*ns/mm2

  static const double gauss     = 1.e-4*tesla;
  static const double kilogauss = 1.e-1*tesla;

  //
  // Inductance [T^2][E][Q^-2]
  //
  static const double henry = weber/ampere;	// henry = 1.60217e-7*MeV*(ns/eplus)**2

  //
  // Temperature
  //
  static const double kelvin = 1.;

  //
  // Amount of substance
  //
  static const double mole = 1.;

  //
  // Activity [T^-1]
  //
  static const double becquerel = 1./second ;
  static const double curie = 3.7e+10 * becquerel;

  //
  // Absorbed dose [L^2][T^-2]
  //
  static const double gray = joule/kilogram ;

  //
  // Luminous intensity [I]
  //
  static const double candela = 1.;

  //
  // Luminous flux [I]
  //
  static const double lumen = candela*steradian;

  //
  // Illuminance [I][L^-2]
  //
  static const double lux = lumen/meter2;

  //
  // Miscellaneous
  //
  static const double perCent     = 0.01 ;
  static const double perThousand = 0.001;
  static const double perMillion  = 0.000001;

}

#endif