SLI map and diagram for Mrk 573. Left panel: SLI map, with colors reflecting SLI values, i.e., the distance of each pixel from the Seyfert/LINER division line in the VO diagram. Black contours trace points on the Seyfert/LINER division line (SLI = 0). The black “X” marks the position of the nucleus. Right panel: corresponding VO diagram, with red indicating Seyfert-like excitation and blue denoting LINER-like excitation. The color intensity scales with the SLI value.