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Fig. 1


Top panel: the distribution of F2 values (see text and Eq. (2)) for the combined sample of O and Y stars, by adopting an uncertainty of 88 m/s on every measurement. The dashed line is a reduced Gaussian distribution (mean of 0 and standard deviation of 1). Bottom panel: same as top, adopting an uncertainty of 220 m/s on every measurement. The dashed line is a Gaussian distribution of mean −2 and unit standard deviation.

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