Microscopic quantities in discharge in air obtained from an electro-mechanical experiment G. Cavalleri, E. Cesaroni, E. Tonni and G. Spavieri Eur. Phys. J. D, 42 3 (2007) 407-424 Published online: 23 March 2007 DOI: 10.1140/epjd/e2007-00131-8