Average $Q_{\rm pPb}$ calculated ($10 < \pt < 20 \, {\rm GeV}/c$) as a function of centrality, with various centrality estimators. The left panel shows results from the data (points) and from the G-PYTHIA calculation (lines). The right panel shows the results for the hybrid method, where centrality classes are selected with ZNA, and $\langle \Ncoll \rangle$ are calculated with the assumptions on particle production described in Sec. \ref{sec:hybrid}