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Fig. 8
log (N/C) as a function of log (N/O) for the stars of the present study and the O supergiants of Bouret et al. (2012) – open stars: spectral type O6-O7.5; open pentagons: spectral type O4-O4.5. The supergiants with log (N/C) > 1.0 are all of spectral type O4.
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