Fig. 2.
Selection of the three sub-populations following criteria as similar as possible to those by Ferraro et al. (2002). The grey dots in the background represent the selected members of ω Centauri; blue dots represent the RGB-MP sample, following the nomenclature by Pancino et al. (2000) and Ferraro et al. (2002); green dots: the RGB-Mint sample; and red dots: the RGB-a sample.
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