Ionisation correction factors ICF(He) vs. excitation parameter x = O2 +/O from the CLOUDY models with various oxygen abundances 12+log O/H and starburst ages. Red dashed, blue solid, and green dotted lines correspond to the starburst ages of 1.0−2.0, 3.5, 4.0 Myr, respectively. Symbols are CLOUDY-modelled data.
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