Top panels: F606W–Δ(F606W−F814W) and F606W–Δ(F438W−F814W) diagrams for the various M 3 and NGC 2808 RGB subpopulations. Symbols are the same as in Fig. 1. Bottom panels: histograms of Δ(F606W−F814W) and Δ(F438W−F814W) for both clusters. Dotted lines denote the mean values of these colour differences for each subpopulation (see text for details).
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