Emission from the ¹³CO 3–2 transition divided over seven velocity bins. Line intensity is summed over the velocity range indicated in each panel (in km   s^-1) and represented as black contour lines. Contour levels are 90%, 80%, ..., 10% of the maximum integrated intensity in the velocity bin: 3.9, 14, 41, 124, 50, 8.1, and 0.95 K   km   s^-1 in the respective bins. As in Fig. 2, the 50%-level contour is thicker, and any contours below 0.7 K   km   s^-1 are not drawn. The total integrated ¹³CO 3–2 line intensity over the entire velocity range is shown in color scale in each panel, for reference.