Abundances of C (bottom and middle panels) and C+N (top panel) in our programme stars, as a function of metallicity (symbols defined in Fig. 2). The C abundances of thick disc (red triangles) and thin disc (red dots) stars from (Bensby & Feltzing 2006; middle panel) and (Suarez-Andres et al. 2017; bottom panel) are also shown to outline the Galactic trend.
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