Top: ¹²CO spectra extracted from different regions of the image. The disc region is found within R+ΔR; the external region begins at R+ΔR and extends as far as 3σ emission is detected in the moment 0 map (≈12″). The total encompasses both of these regions. The systemic velocity as measured by Gaia is indicated by a vertical line. Bottom: moment 8 map of ¹²CO emission, which collapses the cube in the spectral axis and shows the peak emission for each pixel in the cube.