WHAN diagram, showing the region demarcations as provided by Cid Fernandes et al. (2010, 2011). The color code represents the classification as given by the BPT diagrams (see Figure 1): Red dots represent galaxies classified as LINERs, blue dots represent galaxies falling in the composite region, and magenta dots show galaxies without a clear classification. Each region is labeled as follows: SFG for star-forming galaxies, sAGN for strong AGNs, wAGN for weak AGNs, RG for retired galaxies, and PG for passive galaxies.