Thermodynamic properties of high temperature air in local thermodynamic equilibrium: II accurate analytical expression for electron molar fractionsA. D’Angola, G. Colonna, C. Gorse and M. CapitelliEur. Phys. J. D, 65 3 (2011) 453-457DOI: https://doi.org/10.1140/epjd/e2011-20424-5