Orthogonal wide-slit PV diagrams of the SO₂ emission. Flux density in Jy beam⁻¹. The left panel shows the diagram generated by placing the slit at an angle of 145^° (PV1), the right panel by placing the slit orthogonal to the first one (PV2). While PV2 shows a symmetrical emission distribution along both the central offset and velocity axes, the emission pattern in PV1 seems to be tilted clockwise. This is an indication of rotation around the 145^° axis.