Position-velocity diagrams extracted along the major (left) and minor (right) axes of NGC 1097. Slices were taken along paths of length 11′, and a width of 4′ in order to include all the large-scale emission. The major axis slice was aligned at 137°, and the minor slice at 47°. The yellow circles mark the projected rotational velocities used in the ^3DBAROLO modeling. Contours in black range from 1 to 100 × σ in steps of 3σ, where σ is 1.8 mJy/pixel. The yellow line marks the systemic velocity of NGC 1097 at 1258 km/s.