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Fig. 4.


BPT diagrams for SIG galaxies regardless of the morphology (left column) and for isolated E galaxies (both SIG and L16 samples, right column). Galaxies are classified as SFN to the left of the solid line of Kauffmann et al. (2003), transition objects between the solid line and the dashed line of Kewley et al. (2001), or AGN to the right of the dashed line. The black stars and black triangles in the right column show the blue SF isolated Es from the SIG and L16 samples, respectively. The color bars, from top to bottom, correspond to the stellar mass, QLSS, ηk,LSS, and the distance to the fifth nearest neighbor galaxy out to 5 Mpc. The total number of galaxies is indicated in each panel.

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