Contours of the CO(2–1) (top row) and CO(5–4) (bottom row) intensity maps when integrating around the negative velocity peak (left column, solid lines) or the right peak (middle column, dash-dotted lines) of the emissions. The right column shows the two peaks overlaid. The negative and positive velocity peaks correspond to −575 km/s, −50 km/s, and −50 km/s to −475 km/s, respectively, for the CO(2–1) and CO(5–4) emissions. The contours start at 3σ and increase with an indent of 1σ. The background image in the top row (bottom row) is the CO(2–1) (CO(5–4)) emission when integrating the entire peak, as shown in the left (right) panel of Figure 2. The inset shows the spectrum, and the channels we used in the imaging are highlighted with the grey shaded area.