Fig. B.1
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12+log(O/H) as a function of the ionisation degree, O2+/O, for DESIRED-E sample of Galactic and extragalactic H II regions (blue circles, left panel) and star-forming galaxies (black squares, right panel). The red diamonds and lines indicate the mean 12+log(O/H) values and its standard deviation, considering bins of 0.2 in O2+/O.
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