Distribution of the [O/Na] abundance ratios in several GCs from stars observed with the high resolution UVES spectrograph. In the upper panel, about 250 RGB stars in 23 GCs from our FLAMES survey are plotted. Colour coding is red, blue, and green for the P, I, and E components defined in Carretta et al. (2009a). In black we plotted the distribution for NGC 4833 from the present work, with the numbers of stars multiplied by 3 to improve the visibility. Lower panel: distribution of [O/Na] from UVES spectra of about 100 giants in M 4 from Marino et al. (2008).
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