Fig. 3.
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Emission-line flux ratio [NII]λ6583/Hα as a function of [OIII]λ5007/Hβ. Grey, violet, blue and red points represent the main, intensively star-forming, star-forming and passive samples, respectively. Full, dashed and dot-dashed black lines represent the demarcation lines proposed by Kewley et al. (2001), Kauffmann et al. (2003c) and Schawinski et al. (2007), respectively.
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