Mixed-charge $C_3$ (solid blue squares) for each centrality bin for $0.16< K_{\rm T,3}< 0.3$ GeV/$c$ (a) and $0.3< K_{\rm T,3}< 1.0$ GeV/$c$ (b). Open squares represent the corresponding cumulant correlation functions, ${\rm {\bf c}_3}$. Shaded bands represent systematic uncertainties.