Extrapolation to the total number of charged particles as a function of the number of participating nucleons [13]. The uncertainty on the extrapolation is smaller than the size of the markers. The four right-most points are the previously published results [6]. A function inspired by factorisation [2] is fitted to the data, and the best fit yield $a=35.8\pm4.2$, $b=0.22\pm0.05$ with a reduced $\chi^2$ of $0.18$. Also shown is the PHOBOS result at lower energy result [19] scaled to the ALICE total number of charged particles per participant at $\langle N_{\text{part}}\rangle=180$.