The $N_{\text{ch}}$ dependence of the second-order two-particle correlation coefficient $V_{2\Delta} (\text{2PC})$, estimated using the template-fit method, in pp ($|\Delta \eta| > 5.0$) collisions at $\sqrt{s} = 13$ TeV and p--Pb ($|\Delta \eta| > 5.0$ and $|\Delta \eta| > 6.5$) collisions at $\sqrt{s_{\text{NN}}} = 5.02$ TeV.