Fig. 5.
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Relation of the nuclear estimations of log(N/O) and 12+log(O/H) in our sample of LINERs for each grid of photoionization models. The first plot shows the typical errors for the data. The solid back line represents the fit provided by Coziol et al. (1999), the dotted line shows the fit by Andrews & Martini (2013), and the dash-dotted line shows the fit by Belfiore et al. (2015).
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