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Fig. 3
Nitrogen surface abundance (in units of 12 + log (N/H)) as a function of stellar luminosity. Dots represent the single O stars in our sample, whilst triangles are the binary components. Evolutionary tracks are (from left to right) computed for stars with 10, 15, 20, and 40 M⊙ and initial velocities of about 300 km s-1.
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