Fig. 2.
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Distribution of the groups in the plane of the sky in Galactic coordinates. The positions of the B-type stars that give their names to the groups are indicated by the white circles. We show the location of the τ Sco star discussed in the main text. The background image shows the emission in radio, at 857 GHz (left, Planck Collaboration I 2020), and in Hα (right, Finkbeiner 2003).
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