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A detailed study of elliptical and triangular eccentricities in the initialstate of relativistic heavy ion collisions is presented. A model of randomlydistributed sources of energy density in the transverse plane based on theeffective theory of Color Glass Condensate is used. This model describes wellthe ALICE and ATLAS data for Pb+Pb collisions at center-of-mass energy 5.02 TeVper nucleon pair in a wide range of centralities, if the second $v_2$ and third$v_3$ harmonics of the anisotropic flow are simply implied to be proportionalto the eccentricities $\varepsilon_2$ and $\varepsilon_3$ as a reasonableapproximation. The eccentricity $\varepsilon_2$ is closely related with thecollision geometry and its centrality dependence is mainly determined by theedge diffuseness of the region of the uniform distribution of the saturationpulse of the oncoming nucleus. The eccentricity $\varepsilon_3$ is completelydetermined by the chaotic fluctuations of the source position in the region ofoverlapping nuclei and is substantially dependent on the overlap area only.

Exploring the centrality dependence of elliptic and triangular flows