Fig. 1.
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Location in the spectroscopic HR diagram of the 285 Galactic (likely-single and SB1) O-type stars investigated by Holgado et al. (2022; left) and associated v sin i distribution (right). In both cases, the sample of likely single and SB1 fast-rotating stars (with v sin i > 200 km s−1) are highlighted in red. Non-rotating evolutionary tracks from Ekström et al. (2012) are also included in left panel for reference.
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