Same as Fig. 3 but for the 1.3-km s^-1 component. The black contours in the upper panels, from left to right, are plotted as follows: from 0.7 (2.7σ) to 7.0 K km s^-1 (27σ) in steps of 0.7 K km s^-1; at 0.5, 1, 1.5, and 2 km s^-1; and from 0.5 to 2.5 km s^-1 in steps of 0.5 km s^-1. In the lower panels, these contours are from 0.3 (1.1σ) to 2.7 K km s^-1 (9.6σ) in steps of 0.3 K km s^-1; at 0.5, 1, 1.5, and 2 km s^-1; and at 0.5, 1, and 1.5 km s^-1. The C¹⁸O peak position, from which the 1.3-km s^-1 component spectra were extracted (Sect. 3.4), is indicated by a yellow box in the left panels. The effective beam size 30″ is shown in the lower left corner of the upper left panel.