Detailed velocity structure of the spiral cloud. The left panel shows the velocity centroid map, and the right panel shows the velocity FWHM map. Overlaid contours are velocity-integrated ¹³CO(1–0) emission, and the levels correspond to 5.1, 10.2, 15.3 Kkms^-1. In producing these maps, we have excluded vorxels where the emission is below 0.43 K, which corresponds to three times the rms noise level of the data cube.