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Fig. 3.


Assumed ZO/H – [Fe/H] conversion. The blue line results from Eqs. (A.1) and (A.2). We introduce normally distributed scatter (σ = 0.15 dex) around the central relation, indicated by the shaded area (showing 1σ distance from the line). The [Fe/H] = [O/H] relation is shown as the thick orange solid line for reference. The orange dashed lines indicate the solar metallicity in both measures. The black dashed lines roughly indicate the range of [Fe/H] probed in Milky Way studies (see Appendix A).

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