Kinematic minor axis p–v diagrams for [Ar II] (left) and [Ne II] (right). The extraction aperture is 2′′. The 0,0 point in the spatial direction marks the AGN position. The first contour is drawn at three times the standard deviation of the (zero) continuum level. The position of the main expanding shells (Lípari et al. 2005) are marked as horizontal lines. In the right panel the vertical lines denote the estimated virial range.