Comparison of the metallicity and ionization parameter (U = q/c) between the mean sample properties from Nakajima & Ouchi (2014) and Ion2 with 1σ uncertainties. Ion2 is compared to local galaxies from the SDSS survey, a galaxy sample at z ~ 1, a Lyman break galaxy (LBG) sample at z ~ 2.5, a Lyman alpha emitter (LAE) sample at z ~ 2.5, local Lyman break analogues (LBAs), LyC emitters, and Green Peas (GPs). See Nakajima & Ouchi (2014) and references therein for a complete description of these samples.
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