Best fitting isochrones for the decontaminated CMDs (similar to the ones shown in Figure 2) of several sample clusters. The CMDs for each cluster from different surveys, including SMASH, Gaia, and VMC, are plotted in their respective filters and labelled accordingly. The membership probability derived for the VISCACHA sample was adopted for the matched stars in other catalogues as well. The solid line represents the best fitting isochrone, while the dash-dotted isochrones indicate the boundaries that determine the uncertainties of the derived parameters.