  We propose a new parametrization of the distribution of the initial
eccentricity in a nucleus-nucleus collision at a fixed centrality, which we
name the Elliptic Power distribution. It is a two-parameter distribution, where
one of the parameters corresponds to the intrinsic eccentricity, while the
other parameter controls the magnitude of eccentricity fluctuations. Unlike the
previously used Bessel- Gaussian distribution, which becomes worse for more
peripheral collisions, the new Elliptic Power distribution fits several Monte
Carlo models of the initial state for all centralities.
