Lateral distributions, localization methods, ρ(600), size and energy determination in giant EAS

The radial analytical structure functions used in different experiments for charged particles and muons are compared. A minimization method is used, according to each function, to optimize the axis localization, the size and ρ(600) approach and finally the primary energy determination. The procedure of evaluation has been employed for the giant EAS contained in Volcano Ranch and Yakutsk catalogues, as well as for the most energetic event published from AGASA. The best results are obtained using a hypergeometric gaussian function (JNC function) for electrons (or charged)