The $\frac{2}{\langle N_{\rm part}\rangle}\langle$d$N_{\rm ch}$d$\eta\rangle$ for Pb-Pb collisions at $\snn$ = 5.02 TeV in the centrality range 0-80$\%$, as function a of $\langle N_{\mathrm{part}} \rangle$ in each centrality class, compared to model predictions .