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Fig. 10

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C/H as a function of N/H. The symbols correspond to results from spectroscopic analysis from Martins et al. (2008); Hunter et al. (2009); Przybilla et al. (2010); Nieva & Simón-Díaz (2011); Firnstein & Przybilla (2012); Bouret et al. (2012). The evolutionary tracks for various masses between 15 and 60 M are taken from Ekström et al. (2012) (black), Brott et al. (2011a) (red) and Chieffi & Limongi (2013) (magenta).

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