(Left panel): The centrality dependence of $\gamma_{1,1}$, $\gamma_{1,-3}$, $\gamma_{1,2}$ and $\gamma_{2,2}$ for pairs of particles of opposite (OS) and same (SS) sign measured in Pb--Pb collisions at $\sqrt{s_\mathrm{{\rm NN}}} = 5.02$ TeV. (Right panel): The charge-dependent differences $\Delta \gamma_{1,1}$, $\Delta \gamma_{1,-3}$, $\Delta \gamma_{1,2}$ and $\Delta\gamma_{2,2}$ as a function of collision centrality.