Example of an optically selected AGN. In the top two panels, all the valid spaxels are plotted on the [N II]-based and [S II]-based BPT diagrams. In the middle panels, we show the 2D maps of how these spaxels are classified according to the BPT diagrams. In the lower-left panel, we show the Hα EW map. In the lower-right panel, we show the final spaxel-level classification, which combines all the information.