Summed signal amplitude in the V0 scintillators in triggered \PbPb~collisions at \sqrtSnn~=~5.02~\TeV (Top) Correlation between the V0M amplitude, at forward rapidity, and the number of charged-particle track segments (tracklets) reconstructed in the ITS at midrapidity ($\vert\eta\vert1.4$). (Bottom) Fit (red line) to the V0M distribution with a Glauber model coupled to a negative binomial distribution (NBD). Gray and white bands indicate the classification of the events into centrality classes, with centrality expressed in percentile of the hadronic cross section.