Fig. 7.
Spatial distribution of the oxygen abundance as a function of Galactocentric distances for Galactic H II regions (red dots), the mean value obtained for Orion OB1 (dark blue dot), the mean value obtained for the solar vicinity (green dot) and the mean value obtained for Cygnus OB2 (light blue dot). The red dashed line represents the least-squares linear fits to the H II regions. The Sun is assumed at 8 kpc.
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