Fig. 1
Comparison of the measured emission-line fluxes of the two lines in doublets [N ii]λλ6548, 6584 (left) and [O iii]λλ4959, 5007 (right) normalised to the Hβ emission-line flux. Purple points indicate galaxies classified as AGN (Sect. 4). The dashed green line shows the best linear fit to the data, which yields a slope of 0.37 ± 0.02 and 0.34 ± 0.01 for [N ii]λ6548/Hβ vs. [N ii]λ6584/Hβ, and [O iii]λ4959/Hβ vs. [O iii]λ5007/Hβ, respectively (see text in Sect. 3.2 for details).
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