Fig. A.4.
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Classic diagnostic diagrams. Shown are gas excitation [O III]/Hβ vs. log([N II]/Hα) (top), vs. log([O I]/Hα) (middle), and vs. log([S II]/Hα) (bottom). The left and right panels show the (Izotov et al. 2016a,b, 2018a) and LzLCS (Wang et al. 2021; Flury et al. 2022a) samples (Section 2), respectively. Stars, squares, and open triangles represent integrated values. Circles indicate individual Gaussian components; the color bar gives their intrinsic velocity dispersion.
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