The centrality dependence of $\Delta \delta_1$ (a) and $\Delta \gamma_{1,1}$ (b), measured at RHIC  and LHC energies . Statistical and systematic uncertainties are represented by the error bars and the boxes around each data point, respectively. Comparison of the centrality dependence of $\Delta \delta_1$ (c) and $\Delta \gamma_{1,1}$ (d), measured at the highest LHC energy  and estimated with a blast wave  and the AVFD  models (see text for details).