Comparison of (d$N_{\rm ch}$/d$\eta)$ / ($\langle N_{\rm part} \rangle$ / 2) with model calculations for Pb-Pb at $\snn=2.76 $TeV Uncertainties in the data are shown as in Fig. 2 The HIJING 2.0 curve is shown for two values of the gluon shadowing ($s_{g}$) parameter.