  The paper describes lateral density distributions of electrons and muons of
cosmic ray extensive air showers (EAS) in the energy regime of the KASCADE
experiment. Potential EAS observables are extracted while some suitable lateral
distribution functions are introduced to describe these lateral density
distributions of simulated/observed cosmic ray showers. Mass-sensitivity of
these parameters are demonstrated particularly for the KASCADE electron and
muon distributions data. Our studies indicate that the KASCADE data favours an
idea of gradual change of cosmic ray mass composition from lighter
concentration to heavier concentration in terms of these parameters.
