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Fig. 4
Diagnostic diagrams [N ii]/Hα vs. [O iii]/Hβ, [S ii]/Hα vs. [O iii]/Hβ and [O i]/Hα vs. [O iii]/Hβ for the radio emitters taken from Vitale et al. (2012). The contours show galaxy densities in steps of 80 galaxies per each additional contour. The position of the source analyzed here is shown as a red dot.
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