WHAN spectral diagnostic diagram for 1106 host galaxies. SF galaxies are displayed with green triangles and separated by the K03 line. The blue asterisks and red squares respectively are Seyferts and LINERs, which are separated by blue solid line proposed by Kewley et al. (2006, K06). Retired/passive (RP) galaxies are marked by magenta circles and separated by the orange dashed-dotted line proposed by Cid Fernandes et al. (2011, C11). The underlying density distribution of the SDSS emission-line galaxies is shown in grayscale. The grayscale bar in the right represents the number of galaxies in each density bin.