Fig. 3
[Al/Fe] ratios derived in this work as a function of abundances of other proton-capture elements from Carretta et al. (2011a): [Na/Fe] (upper left panel), [Mg/Fe] (upper right), [O/Fe] (lower left), and [Si/Fe] (lower right). Green triangles are RGB stars with UVES spectra in NGC 1851, from Carretta et al. (2011a). Arrows indicate upper limits in Al abundances.
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