Fig. B.1.
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Top: Spatial distribution of our sample of O-type stars in the Galactic plane, with the Sun (⊙) at the center. Same marker code as in Fig. 1. Bottom: Values of the Galactic present-day abundance gradient of C, N, O as a function of galactocentric distance (RG), from Arellano-Córdova et al. (2020, 2021). Distances from Bailer-Jones et al. (2021)
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