Complementary ¹³CO distributions of the two velocity components of G013.313. The colour image represents the integrated velocity range of 18.76–20.92 km s⁻¹. Contours correspond to a range of 15.5 to 17.9 km s⁻¹. Contour levels are set at 4.4, 6.0, 7.6, 9.2, 10.8, 12.5, 14.1, and 15.7 K km s⁻¹. The colour image highlights the red-shifted cloud, whereas the contours depict the blue-shifted cloud. Panels (a) and (b) show the maps before and after the displacement of the blue-shifted cloud contours, respectively.