Position-velocity (PV) diagrams perpendicular to and averaged along the main axes of the MFS-warm, MFS-cold, and IFS regions (from left to right, see boxes in Fig. 6). The PV maps are in units of K(T_MB) and correspond to the ¹³CO(2–1) and C¹⁸O(2–1) emission at the top and bottom, respectively. The white contours indicate the C¹⁸O(2–1) intensity and are the same for the two panels of the same filament system. The magenta contours in the left panel correspond to the ¹³CO(2–1) intensity. The zero offset position (on the x-axes) corresponds to the Galactic south side of the filament systems. At the distance of this cloud 10’ corresponds to 3.8 pc. The position of the filaments are indicated with a dark blue circle and the velocity gradients induced by the compression are shown as converging red dashed arrows toward the filament. Longitudinal PV diagrams along the crest of VCF 32 of the MFS-cold region are shown in Fig. C.1.