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Fig. 2

image

log(N/C) – log g diagram for the sample stars (filled circles) and comparison late-type supergiants (open circles). Evolutionary tracks including rotation from Ekström et al. (2012) are overplotted, labeled by initial masses. The dotted line shows the initial chemical composition. For non-rotating models, N/C remains at the initial value (dotted line) throughout the main sequence and early post-main sequence phases.

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