a)¹²CO (1–0) intensity-weighted velocity map. The color bar represents the velocity in units of km s^-1. b) The position-velocity diagram of the ¹²CO emission averaged over the observed range in latitude and plotted against its longitude. The color bar represents intensities in units of K. The lowest contour is 0.4 K, and each contour is twice the previous one. The clouds are also marked in this panel.