Fig. 2
Nitrogen surface abundance (in units of 12 + log (N/H)) as a function of projected rotational velocity, the so-called Hunter diagram. O stars in our sample are shown in black, the O stars of NGC 2244 (Martins et al. 2012) in red, stars studied by Bouret et al. (2012) in blue, and the MiMes O-type stars (Martins et al. 2015) in green. Grey lines define the possible locations of the different groups.
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