Fig. 2
BPT diagram (Baldwin et al. 1981). The contours show the density of SDSS emission line galaxies. The dotted and the dashed lines of Kewley et al. (2001) and Kauffmann et al. (2003), respectively, separate star-forming galaxies, AGNs, and composite galaxies. The filled circles, filled triangles, and crosses show the measurements at the position of the SN, the galaxy nucleus, and the total galaxy spectrum, respectively.
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