Fig. A.1
[ O III ] λ 5007/Hβ vs. [ N II ] λ 6584/Hα diagram with a grid color-coded like in the legend of Fig. 4 according to metallicity. Virtually all galaxies on the star-forming sequence (between the black dashed lines) and above the magenta line (i.e., with [ O III ] λ 5007/Hβ> 1.8) have O/H < 8.6 on the KD02 metallicity scale (cyan symbols).
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