Figure 4

Centrality dependence of $\chi$ in Pb--Pb collisions at $\sqrt{s_{_{\rm NN}}} = 2.76$ TeV. Hydrodynamic calculations from ${\tt VISH2+1}$~ are shown in shaded areas and the one from ${\tt IP}$-${\tt Glasma+MUSIC+UrQMD}$~ are shown with open bands.
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