Strength of Forward-backward event-mean transverse momenta correlations (bcorr) in Pb-Pb collisions at 2.76 TeV in comparison with AMPT, as a function of <dNch/dEta>. Centrality classes of 5% width (by V0M in data and using multiplicity in V0 acceptance for AMPT, which was split into quantiles). Green dashed line is for AMPT (LHC13f3c, kine-level, string melting ON, rescattering ON), pink line for string melting ON, rescattering OFF, orange line for string melting OFF, rescattering ON. 

FB windows ηgap=0.8, window width δη=0.4, pT range 0.2-2.0 GeV/c. Data points: rectangles represent systematic uncertainties, statistical errors are shown as vertical bars and usually are of the similar size as the marker. 

Values of <dNch/dEta> for data were tuned using ALICE paper https://arxiv.org/pdf/1012.1657.pdf, horizontal error bars correspond to the uncertainties from Table 1 in this paper.