Top: ¹³CO channel maps from TRAO data. Middle: ¹³CO channel maps from IRAM data. Bottom: ¹²CO channel maps from IRAM data. The channel velocities are written in the top corners. In the two first and last frames, the sources from the GCC catalogue are shown as white ellipses and the arc and bar regions are shown as white lines. The north clump and NGC 2264 H are labelled as “s1454” and “s1446” in TRAO maps, and “N” and “H” in IRAM maps, respectively.Scale bars are in the next to last frames.