Contours of the integrated CO (J = 3→2) (red contours) and HCO⁺ (J = 4→3) (green contours) emission over-plotted on the 350 GHz continuum image (pseudocolour). The levels for the contours are –4, –3, 3, 4, 5, and 6 times the rms of the CO (J = 3→2) moment 0 map (0.024 Jy/beam km/s) and –3, 3, 4, 5, 6, and 9 times the rms of the HCO⁺ (J = 4→3) moment 0 map (0.021 Jy/beam km/s). Dashed lines indicate negative contours. The negative features north and south of the AGN are caused by the short baselines missing in the imaging process. The beam size and shape (∼15.5×∼16.5 mas with a PA of –43°) for the two lines and the continuum are very similar, as marked by the ovals in red and cyan, respectively, in the lower left corner of the figure.