Fig. 4
Intensity of the 21 cm line of neutral hydrogen towards Sco–Cen. Left (right) panel: emission integrated between −20 and 0 km s−1 (0 and 10 km s−1). The numbers in the yellow boxes show upper distance limits for the Hi features derived from velocity-matched Nai absorption lines against stars with distances known from parallax measurements by Hipparcos and Gaia.
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