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Fig. 4.
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Excitation ratio [O III]/[O II] as a function of W(Hα) (left) and W[O III] (right). Only objects with a S/N of at least of 3 have been plotted. Dark blue is for OPARGs. Cyan is for ‘active’ galaxies from the MGSz sample according to the Stasińska et al. (2006) line (see text).
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