Fig. 3
Radial profiles of several emission-line ratios based on the optical reddening-corrected emission lines across the annuli in the three defined regions. From up to down and left to right: R23, [O ii]/[O iii], [N ii]/Hα [O iii]/[N ii], [N ii]/[O ii], and [N ii]/[S ii]. Symbols and lines are the same, as defined in Fig. 2.
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