Fig. 4.
Log(R23 − 0.08O32)−(12 + log O/H) relation for SFGs with 12 + log O/H ≤ 7.4 from Table A.2. The SFGs from the SDSS with 12 + log O/H derived by our newly introduced direct method and by the semi-empirical method are shown by open circles and open triangles, respectively. Other symbols and the solid line are the same as in Fig. 1b. Solid lines connect different observations of the same object. Some extremely low-metallicity SFGs from the literature are labelled.
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