Continuum-subtracted channel maps of the CO emission corrected for υ_*. The central observed frequency is the average over the observation epochs. The contours are drawn at 3, 12, 25, and 40 times the rms noise value outside the line (1.25 × 10⁻³ Jy beam⁻¹). Length scales are indicated in the bottom left panel. Flux units are in Jy beam⁻¹. The continuum peak is located in the centre of the brightest contour. The beam size is not illustrated on the plots because it is too small (0.184″ × 0.171″). The emission exhibits a high degree of structure. Faint filaments are visible at large distances from the continuum peak position. At υ = 0 km s⁻¹ a spiral shape can be seen, with a bright centre.