Abstract
We have argued that the azimuthal symmetry and asymmetry components in Fourier expansion of particle momentum azimuthal distribution, vn(n = 0,1,2,…), should be calculated as an average of cos (nϕ) first over particles in an event and then over events (eventwise average) rather than "an average over all particles in all events" (particlewise average). In case of large centrality (multiplicity) bin the particlewise average is not accurate because the influence (fluctuation) of particle multiplicity was not taken into account.
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