The centrality dependence of $f_{\text{CME}}$ extracted from correlations measured relative to the spectator and participants planes according to Eq.7 in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV. Statistical uncertainties are shown as vertical bars, and systematic uncertainties are shown as boxes. A constant fit is shown along with a 95\% confidence level band.