Diagrams of the velocity structure of the N 66 gas. The left panel shows the velocity-integrated intensity of [ CII ] in color (K km s^-1 scale), with the integrated intensity of the CO (3−2) transition superposed in black contours (starting at 3 K km s^-1 increasing in steps of 2 K km s^-1). The three panels at the right contain the position-velocity maps along the cuts indicated in the left panel, with position (in arcsec) increasing along the direction indicated by the arrows in that panel. Note the ring-like distribution of clumpy emission in the ridge depicted in the lower two panels. The panel at the top contains the orthogonal cut through the plume, showing more continuous and brighter emission.