Results of CASSIS modelling. Panel a: excitation temperature. Panel b: observed velocity. Both maps have been deprojected similarly to Fig. 2 (we note that the velocities are not yet corrected for inclination). The 1.21 mm continuum emission as shown in Fig. 2 is overplotted as contours in both panels. The maps are masked to values above 4σ in the continuum map. The deprojected beam is shown in the bottom left corner of each panel.