text: #!/usr/bin/python
  # -*- coding: utf-8 -*-
  # Copyright CNRS 2012
  # Roman Yurchak (LULI)
  # This software is governed by the CeCILL-B license under French law and
  # abiding by the rules of distribution of free software.
  
  # List of CGS units used in hedp module
  from scipy.constants import physical_constants
  
  eV2K = physical_constants['electron volt-kelvin relationship'][0]
  eV2Hz = physical_constants['electron volt-hertz relationship'][0]
  
  
  R_CST = physical_constants['molar gas constant'][0]*1e7 # erg.K⁻¹.mol⁻¹
  SIGMA_B_CST = physical_constants['Stefan-Boltzmann constant'][0]
  
  a_r = 7.565730e-16*1e7*1e-6 # erg.cm^-3.K-4
  
  