Fig. 4
Left panel: correlation between total absolute magnitude and the interquartile range of the [O/Na] ratio for GC in our FLAMES survey (Carretta et al. 2009a, 2010b, 2011a, 2013b, 2014b, 2015, and references therein). Right panel: relation between the maximum temperature along the HB (Recio-Blanco et al. 2006; Carretta et al. 2007) and IQR[O/Na]. In each panel NGC 6139 indicated by a filled green star. The Spearman rank correlation coefficient rs and the Pearson linear correlation coefficient rp are listed in each panel.
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