Position-velocity diagrams of cut A, B, and C (from top to bottom) in ¹³CO(2–1)(left panel) and C¹⁸O(2–1)(right panel) along a line through the middle of the cut. The x-axis gives the position along this line. The white arrow in the bottom right corner of the left panels indicates the orientation of the cut in the celestial coordinate frame. The white crosses indicate the velocity of the peak intensity at each x-position. The cutoff is set to 1 K in ¹³CO(2–1)for all three cuts and 0.5 K in C¹⁸O(2–1)for cuts B and C. The C¹⁸O(2–1)cutoff for cut A is 0.3 K. All maps have been convolved with a Gaussian of two pixels or approximately one beam.