Figure 7

The charged-particle pseudorapidity density distribution per participating nucleon pair for three centrality bins shown in the rest frame of one of the projectiles by using the variable $\eta' = \eta - y_{\mathrm{beam}}$ ($y_{\mathrm{beam}} = 7.99$). The ALICE results are extrapolated to further values of $\eta'$ by fitting to the difference of two Gaussian functions (described in the text) and fitting a straight line to the last few points on the curve. These results are compared to lower energy data.