Diagnostic diagrams of the central spaxels in our sample of galaxies. The color bar shows the equivalent width for Hα (W_Hα). The solid and dashed lines represent the region limits as defined by Kewley et al. (2006), with the exception of the separation between Seyfert 2 and LINERs in the [NII]/Hα diagram, which was taken from Cid Fernandes et al. (2010). Each region is labeled as follows: SFG for star-forming galaxies, SEY for Seyferts, LIN for LINERs, and COM for composites.