Fig. 6
Same as Fig. 3 with comparison stars added (grey squares). The comparison stars are from Bouret et al. (2005), Martins et al. (2012), Bouret et al. (in prep.), Escolano et al. (in prep.), Hunter et al. (2009) and Przybilla et al. (2010). The size of the symbols (including the six magnetic O stars) is now proportional to the N/H value. The evolutionary tracks are for v = 300 km s-1.
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