Fig. 5
Emission line diagnostic diagrams. Galaxies belonging to the 60 μm complete sample of Mazzei et al. (2001) are represented with filled triangles; light (cyan) curves in all the three panels show the extreme starburst definition of Kewley et al. (2001); bold curve (magenta) shows the pure SF limit of Kauffmann et al. (2003); and red lines the LINER/AGN divisions from Kewley et al. (2001) and Kewley et al. (2006). Upper panel: log [OIII] λ5007/Hβ versus log [NII] λ6583/Hα. Middle panel: log [OIII] λ5007/Hβ versus log [SII] λ 6716, 6731/Hα. Lower panel: log [OIII] λ5007/Hβ versus log [OI] λ6300/Hα.
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