Fig. 13

Left: distribution of v sin i in the sample. Different colors have been assigned to different luminosity classes. Right: cumulative histogram of two samples. Green is our sample, the standard stars. Blue is a more general sample of O stars, studied in Simón-Díaz & Herrero (2014). There is one star (HDE 229196, O6 II, v sin i ~ 250 km s−1) which does not appear in the histogram.
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