A study on the fitting functions of energy deposit profile of cosmic rays sh owers

Longitudinal development of extensive air showers generated by ultra high energy cosmic rays and measured by experiments are usually reconstructed by fittin g a trial function. By this fit, it is possible to get important parameters like Xmax and energy of the shower. In this study, we have tested two kinds of trial function, Gaisser-Hillas and Gaussian in age. We have used a large set of simulated showers generated by CONEX. The fitting stability was tested under the effect of fluctuations and cutting shower profiles.