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Fig. 2.
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C, N, O abundances in the selected RGB sample. Left: [(C+N)/Fe] vs [Fe/H]. Centre: [O/Fe] vs [α/Fe]. Right: [(C+N+O)/Fe] vs [α/Fe], the dashed lines show the trend when assuming the α-enhancement from Asplund et al. (2009) solar mixture as in Eq. (2). The colour-coding is the same as in Fig. 1.
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