Fig. 9
Comparison of the extent of the Na-O anticorrelations of several GCs relative to M 75; Top panel: the Na-O anticorrelations in M 75, NGC 1851 (Carretta et al. 2011b), and M 4 (Carretta et al. 2009c); Bottom panel: the Na-O anticorrelations in M 75 and 47 Tuc (Carretta et al. 2009c). Simple dilution models are overimposed. The [O/Fe] abundances of M 75 are shifted by the mean discrepancy of [Fe I/Fe II] = −0.14 dex to match the other studies.
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