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Fig. 3.
Galactic distribution of the O-type stars from Gaia EDR3 (dots) and the VLBI masers (crosses, Reid et al. 2019). Only the O-type stars with parallax uncertainties < 10% are shown. Sources located in the Perseus Arm (black), the Local Arm (blue), and the Sagittarius-Carina Arm (magenta) are indicated by different colors.
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