Fig. 5
[Na/H] versus Teff of the AGB and RGB stars (red and blue symbols, respectively) in NGC 6809, NGC 6121, NGC 2808, and NGC 104 from the present analysis and Paper I. The horizontal black dashed lines mark the critical [Na/H] ratio separating roughly the Na-poor 1P and Na-rich 2P stars according to Carretta et al. (2009) criteria. The clusters are presented by increasing [Fe/H] from left to right.
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