¹³CO (J = 2−1) line velocity along F-south to F-west. The blue lines indicate the velocity gradient in the F-west and F-south part 1. The vertical black dotted lines indicate the position of HII region along the filament, and red arrows indicate the location of the numbered pre-stellar and proto-stellar clumps located along the filament. The data points circled by the red ellipse is the HVC high-velocity component defined in the right panel of Fig. 1.