Open Access

Fig. 9.


Distribution of the line ratios [OI]λ6300 Å/Hα (upper left panel), [SII]λ6716,6731 Å/Hα (upper right panel), [NII]λ6548,6583 Å/Hα (lower left panel), and [OIII]λ5007 Å/Hα (lower right panel) line ratios for emission lines with a S/N >  5.

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