Fig. 1.

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[O III]λ 5007/Hβ versus [N II]λ 6583/Hα diagnostic diagram (BPT) for isolated galaxies (left panel), galaxies in isolated pairs (middle panel), and galaxies in isolated triplets (right panel). In each panel, blue, green, and red points represent SF galaxies, composite galaxies, and AGN galaxies, respectively. Grey points show the position in the BPT diagram of the SDSS galaxies in the MPA-JHU catalogue. The dashed line shows the Kewley et al. (2001) demarcation and the continuous line shows the Kauffmann et al. (2003b) curve.
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