  Large surface arrays of current cosmic ray experiments measure the signals of
electromagnetic or muonic components or their combination. The correction to
the zenith angle (the attenuation curve) has to be taken into account before
the signal is converted to the shower energy. Either Monte Carlo simulations or
indirect estimation using collected data (Constant Intensity Cut method) can be
used. However, the assumptions of composition or isotropy used for the
determination of the attenuation curve can still influence the final physics
results such as the energy spectrum, or modify anisotropy searches and
composition analysis. Using simplified Toy Monte Carlo with an output from
CORSIKA simulations we try to find several examples of what kind of effects can
be caused by the methods of inferring the attenuation curve. Surface arrays of
different sensitivities to electromagnetic and muonic components were
considered.
