Extracted \scs as a function of the minimum pseudorapidity gap between the centrality estimation and transverse-momentum spectra measurement in Pb--Pb collisions at \fivenn. The results are compared with the \scs value measured by the CMS Collaboration (with a minimum $|\Delta\eta|=2.5$) . The uncertainty bars around the data points represent the sum in quadrature of the statistical and systematic uncertainties (not visible). Predictions from Trajectum are shown as continuous lines, with mesh bands indicating the total uncertainty (statistical and systematic combined in quadrature). Predictions from the HIJING model are shown as dashed lines, with shaded bands representing statistical uncertainty only. See the main text for details on the uncertainty estimation in the model \scs values. The Lattice QCD prediction of \scs for deconfined matter is obtained from the HotQCD Collaboration . Centrality-estimator definitions are presented in Table ???.