Normalized equivalent widths of the [O iii]λ5007 line as a function of NLR metallicities, predicted by photoionization models. These are normalized at their respective peaks. Black solid, dashed, dot-dashed, and dotted lines are the photoionization model calculations with (log nH, log U) = (1.0, −1.5), (1.0, −3.5), (4.0, −1.5), and (4.0, −3.5), respectively. Given parameters are also labeled for each line.
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