Figure 2

$C_2$ for same-charge (solid red circles) and mixed-charge pions (open blue squares) for 0-5% centrality (a) and 45-50% centrality (b). The global fits with dotted lines correspond to Gaussian same-charge fits ($E_{\rm w}=1$). The global fits with solid lines correspond to non-Gaussian fits with Edgeworth coefficients ($E_{\rm w}\neq1$). Shaded boxes represent the momentum resolution correction uncertainty. FSI uncertainties are smaller than the symbol sizes.