BPT emission line diagnostic diagram. The K03 line in grey separates the SF galaxies (red symbols) and composite objects (blue symbols) regions, while the Ke01 demarcation line in black distinguishes between AGN/LINERs and composite objects. The black dashed line divides between optically classified AGN (green symbols) and LINERs (magenta symbols). The elusive AGN studied in Pons & Watson (2014) are shown by yellow triangles.
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