Velocity and column density in G35.20. Left: NH₃ fitted centroid velocity overlaid with ALMA 870 μm contours as in Fig. 3. The box and arrow indicate how the PV cuts are made on the right panels. Right: The top panel is a PV cut showing the averaged centroid velocity (beam by beam) of the entire NH₃ filament along the direction pointed by the arrow in the left panel, starting from the northern end down to the southern end of the NH₃ filament shown in the left panel. The zero point is located between cores A and B. The red line is a linear fit excluding data between cores A and B. The middle panel is a pixel-by-pixel (instead of beam by beam) PV cut along the black-box region in the left panel after subtracting a global velocity gradient (red line in top panel). The bottom panel corresponds to the NH₃ column density profile. The positions of the six ALMA cores A-F are marked with dashed vertical lines.