Fig. 1.
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BPT diagram (Baldwin et al. 1981) for classification of objects with respect to their activity. The classification is obtained given the location of the objects in the diagram. The regions are marked according to the curves defined by Kewley et al. (2001), Kauffmann et al. (2003), and Schawinski et al. (2007) which are indicated in the diagram. The line ratios are described in Kauffmann et al. (2003).
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