Close-up of periodic drip-like structures along the GMC ridge. The central panel shows NANTEN ¹²CO(J = 1–0) data integrated over the velocity range −26.3 < v_LSR < −23.0 km s⁻¹. Both the color and the white contours show the same data, with the contour levels set at intervals of 2.5 K km s⁻¹. White arrows mark the locations of drip-like features spaced at approximately equal projected distances along the bottom ridge of the cloud. The black boxes labeled "A" and "B" mark areas observed at higher resolution with the Mopra telescope. The right and left panels show velocity channel maps of this higher resolution data. The colored images and white contours are ¹²CO(J = 1–0), and black contours are ¹³CO(J = 1–0). Contour levels begin at 2.5 K and are incremented every 1.0 K for ¹²CO, and begin at 0.8 K incremented every 0.5 K for ¹³CO. Numbers in the top left corner of each sub-panel indicate the central velocity of the displayed channel.