Position-velocity diagrams for [C ii], CO(4−3), ¹³CO(3−2), CO(6−5), and CO(7−6) along directions given by position angle, PA of 0, 90 and 135°. The contours are at 10% to 100% (in steps of 10%) of the maximum T_mb of each plot. For each column we give the maximum T_mb from top to bottom. For PA = 90° the values are 56.9, 72.8, 24.3, 69.5 and 54.9 K. For PA = 135° the values are 53.5, 80.5, 41.5, 78.2 and 62.3 K. For PA = 0° the values are 53.6, 64.3, 29.2, 56.6 and 43.3 K. HD 37903 is at 0′′. The position angle is measured counterclockwise from north.