Maps of CO and HCO⁺ linewidths s (Eq. (1)) in the nuclear region of NGC 1068. Emission linewidths are shown in blue-yellow pseudocolour according to the colour bar at right. Top: CO (J = 3→2) emission linewidths. Bottom: HCO⁺ (J = 4→3) emission and absorption linewidths (white-brown colour bar shown in the inset). In each plot, the ellipse in the lower left corner represents the beam size. North is up, and east is left. The black star marks the position of the supermassive black hole, and the small colourful dots represent the H₂O megamaser disc (Gallimore et al. 2004).