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Fig. 11.

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Histograms of the Gaia distances of different samples. Upper panel: histogram of the Gaia distance of OB star candidates (between 282° and 285.5°) from Mohr-Smith et al. (2017; grey) overplotted with the Xu et al. (2021; blue) and Chen et al. (2019) OB stars samples (red). Lower panel: histogram of the Gaia distances of the OBA star sample from Zari et al. (2021). All stars follow RUWE ≤ 1.4 and π/σπ > 5).

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