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Fig. 13.
Radial gradient of oxygen abundance traced by young objects of the Galactic disk: OB stars from this work (red circles) and from Daflon & Cunha (2004; blue squares); cepheids from Luck (2018; open circles); SFR regions from Spina et al. (2017; green triangles); and H II regions from Esteban et al. (2017; orange triangles).
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