Fig. 3.
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Theoretical boundaries of N/C and N/O based on changes in the CNO ratio following the description given by Martins et al. (2015) for the elemental mixtures adopted by Brott et al. (2011) (grey dashed line), Nieva & Przybilla (2012) (black dashed-dotted line), and Asplund et al. (2009) (light grey dotted line). The position of the binary star from Tkachenko et al. (2020) are shown with their respective error bars.
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