export G, C, M_P, K_B, SIGMA_T, SIGMA_SB, 
M_SUN, YEAR_TO_SEC, SIGMA_E, H_PLANCK, ERG_TO_KEV, HZ_TO_KEV, UV_LOW_KEV, UV_HIGH_KEV

# all in cgs
const G = 6.6743e-8
const C = 29979245800.
const M_P = 1.67262192369e-24
const K_B = 1.380649e-16
const H_PLANCK = 6.62607015e-27 
const SIGMA_T = 6.6524587321000005e-25
const SIGMA_E = SIGMA_T / M_P
const SIGMA_SB = 5.6703744191844314e-05
const M_SUN = 1.988409870698051e+33
const YEAR_TO_SEC = 31557600.0
const ERG_TO_KEV = 6.24150907e+08
const HZ_TO_KEV = 4.1356677e-18
const UV_LOW_KEV = 0.00387
const UV_HIGH_KEV = 0.06
