Fig. 3
Diagnostic diagrams to classify emission-line galaxies according to their dominant ionisation mechanism for the barred (left) and unbarred (right) galaxies of the sample. The solid and dash lines separate the region of star-forming galaxies from the region of AGN according to Kewley et al. (2001) and Kauffmann et al. (2003a), respectively. The horizontal dot-dashed line separates the AGN region into Seyfert and LINER galaxy regions (Kewley et al. 2006).
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