Skewness of elliptic flow $\gamma_1^\text{exp}$ of inclusive charged particles as a function of centrality, for Pb--Pb collisions at $\sqrt{{\textit s}_\text{NN}} = 5.02$ TeV. Hydrodynamic calculations for Pb--Pb collisions at $\sqrt{{\textit s}_\text{NN}} = 2.76$ TeV are shown for comparison.