Position-velocity (P-V) maps of CO emission from the Circinus galaxy. From left to right: P-V diagrams of ¹²COJ = 3 → 2, ¹²COJ = 4 → 3, and ¹²COJ = 6 → 5. The slice is taken along the major axis obtained from ¹²COJ = 3 → 2 (position angle: 33.°5, see Table 4) and the direction is from northeast (bottom) to southwest (top). The contours are from 30% to 90% of the peak intensities with a spacing of 20%.