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Fig. 1


[OIII] λ 5007/Hβ versus [NII] λ 6583/Hα diagnostic diagram (BPT) for the SDSS galaxies. Blue, green, and red points represent star-forming galaxies in the present work (209 276), composite galaxies (57 926), and AGN galaxies (19 392), respectively. The dashed line shows the Kewley et al. (2001) demarcation and the continuous line shows the Kauffmann et al. (2003a) curve.

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