Comparison of the observed colour distribution in 47 Tuc with theoretical isochrones from three different sets of models. For each set, two isochrones are shown with distinct [O/Fe] to represent the mPOPs distribution of oxygen abundances in the cluster. The shaded area spans the 5th and the 95th percentiles of the colour spread at each magnitude with the median percentile (the ridgeline) shown in green. G24 refers to Gerasimov et al. (2024b).