CO 3−2 moment maps. Top: integrated intensity (mom0) where contours are 1.7 × (1, 2, 4, 8, 16, 32, 64) Jy km s^-1 beam^-1. Colours range from 0 to 172 Jy km s^-1 beam^-1. Centre: velocity field (mom1) where contours range from 1690 km s^-1 to 1820 km s^-1 in steps of 10 km s^-1. Bottom: dispersion map (mom2) where contours are 4.4 × (1, 3, 5, 7, 9, 11, 13) km s^-1. Colours range from 0 to 66 km s^-1. The cross indicates the position of the 345 GHz continuum peak (see Table 1).