Fig. 5

Upper left panel: fit to the CN(6,2) 6478.48 Å bandhead in star 238. Upper right panel: fit to the [O i] 6300.3 Å line in star 235. Symbols are the same as in Fig. 4 (upper panel). Lower panel: [O/Fe] abundance ratio as a function of the metallicity for the five sample stars (filled red circles), compared with literature abundances from Bensby et al. (2013; filled black triangles), Barbuy et al. (2014; open black stars), Johnson et al. (2014; open grey circles), and Barbuy et al. (2015; filled grey circles).
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