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Fig. 12.

Fig. 12. Refer to the following caption and surrounding text.

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Growth of the contribution of Fe IIincons in total Fe II, with the increase of the REdd and decrease of the [O III]/HβNLR. The sample is divided into five subsets according to the Fe IIincons/Fe IItot ratio: (1) Fe IIincons/Fe IItot < 0.1 (87 objects), (2) 0.1 < Fe IIincons/Fe IItot < 0.2 (134 objects), (3) 0.2 < Fe IIincons/Fe IItot < 0.3 (187 objects), (4) 0.3 < Fe IIincons/Fe IItot < 0.4 (320 objects), and (5) Fe IIincons/Fe IItot > 0.4 (293 objects). For each subset, we found the mean of EW Fe IItot and REdd, which are plotted with black dots and indicated by the corresponding numbers (1–5). Additionally, the points are coloured according to log([O III]/HβNLR) strength.

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