// Mathematical and physical constants
`ifdef CONSTANTS_VAMS
`else
`define CONSTANTS_VAMS 1
// M_ is a mathmatical constant
`define    M_E        2.7182818284590452354
`define    M_LOG2E    1.4426950408889634074
`define    M_LOG10E   0.43429448190325182765
`define    M_LN2      0.69314718055994530942
`define    M_LN10     2.30258509299404568402
`define    M_PI       3.14159265358979323846
`define    M_TWO_PI   6.28318530717958647652
`define    M_PI_2     1.57079632679489661923
`define    M_PI_4     0.78539816339744830962
`define    M_1_PI     0.31830988618379067154
`define    M_2_PI     0.63661977236758134308
`define    M_2_SQRTPI 1.12837916709551257390
`define    M_SQRT2    1.41421356237309504880
`define    M_SQRT1_2  0.70710678118654752440
// P_ is a physical constant
// charge of electron in coulombs 
`define    P_Q        1.6021918e-19
// speed of light in vacuum in meters/sec
`define    P_C        2.997924562e8 
// Boltzmann's constant in joules/kelvin
`define    P_K        1.3806226e-23 
// Planck's constant in joules*sec
`define    P_H        6.6260755e-34 
// permittivity of vacuum in farads/meter
`define    P_EPS0     8.85418792394420013968e-12 
// permeability of vacuum in henrys/meter
`define    P_U0       (4.0e-7 * `M_PI) 
// zero celsius in kelvin
`define    P_CELSIUS0 273.15 
`endif