Stars in NGC 6752 from Carretta et al. (2007) compared to our final sample (grey triangles). In NGC 6752 different symbols represent stars with measured O, Na abundances of the primordial P component (red circles), the intermediate I component (blue circles), and the extreme E component (cyan circles) defined as in Carretta et al. (2009a). Green open star symbols indicate cluster stars with only Na abundance measured.
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