Fig. 8.
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Odd-Z elements, Na (top panel) and Al (bottom panel), abundances as a function of metallicity [Fe/H]. Symbols: Crosses correspond to M 62 (gold; Yong et al. 2014), NGC 6558 (red; Barbuy et al. 2018b), NGC 6552 (green; Barbuy et al. 2021), and HP 1 (purple; Barbuy et al. 2016). The pink square shows the mean value of Pal 6. The filled dots are the mean abundances, together with the error bars.
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