Top panel: centroid velocity map of the C¹⁸O (1-0) line. Middle panel: Centroid velocity map of the ¹³CO (1-0) line. In both maps, we highlight six selected profiles at specific positions along the Snake, marked by white stars. The cyan contours represent the C¹⁸O (1-0) integrated intensity at levels of 0.8 K and 1.6 K. The beam size is shown in the bottom-left corner, and the scale bar in the bottom-right. Bottom panel: comparison of the six spectral profiles corresponding to the positions marked by white stars in both maps. The dashed orange profiles represent the C¹⁸O (1-0) line multiplied by 5, and the solid purple profiles correspond to the ¹³CO (1-0) line. The dashed black lines indicate the peak velocity of the ¹³CO (1-0) line, with the velocity values labeled next to them.