Fig. 3.
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Observed Ne3O2 ratio vs. O32 (left panel) and [O III]λ4363/Hγ vs. [O III]λ5007/[O III]λ4363 (right panel) for the z ∼ 8 galaxies (black stars: our measurements; green stars: data from Curti et al. 2022), the Izotov-DR14 sample of star-forming galaxies (grey and red points, according to EW(Hβ) < 100 Å and > 100 Å, respectively), and the LzLCS sample (blue points).
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