Carbon mass fraction as a function of nitrogen mass fraction for the sample stars. The red squares (blue triangles) are the Galactic (LMC) objects. The Galactic compared stars are shown by the purple circles. Evolutionary tracks from Meynet & Maeder (2005) at solar (LMC) metallicity are shown by red (blue) lines. The solar-metallicity tracks of Ekström et al. (2012) are shown by the dark red lines. Solid and dashed lines correspond respectively to 25 (30 at LMC metallicity) and 60 M⊙ stars.
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