WHAN diagnostic diagrams for the cross-matched (orange) and the SDSS (red) samples. The upper-left panel shows the radio emitters of the SDSS superimposed on the SDSS parent sample. The lower panels represent samples where a less severe error cut (only on [Nii] and Hα) has been applied. In this way, a considerable number of objects have been recovered, which appear to be classified as wAGNs or RGs. Density levels represent 70 galaxies per contour in the middle panels, 500 galaxies per contour in the upper-right panel and 2000 galaxies per contour in the bottom-right panel.