Fig. 4.
Left panel: Na-O anti-correlation ([Na/Fe] versus [O/Fe]) for the sample of GCs studied by Carretta et al. (2009a,b). M4 and 47 Tuc stars are marked as red open squares and magenta crosses, respectively. The short- long-dashed red and magenta lines indicate the separation between FG and SG stars in the two clusters, according to Carretta et al. (2010). Right panel: same as left panel, but for NGC 288 (magenta crosses), Ter 8 (Carretta et al. 2014, open blue triangles for stars with both O and Na measures), and NGC 6535 (Bragaglia et al. 2017, upper limits excluded). Middle panel: E3 (filled red squares) and Ter 8 (Carretta et al. 2014, stars with Na measures only) Na abundances.
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