Iso-velocity maps of the different molecular lines observed in NGC 1068. The gray scale corresponds to the velocity-integrated emission of each line with the same contours as used in Figure 2. The velocity contours are in steps of 10 km s ⁻¹ around the systemic velocity of NGC 1068. The gray lines indicate the cuts along which the position–velocity diagrams (see Figure 10) were taken for the respective molecules ( ¹²CO( J = 2–1), ¹²CO( J = 2–1), and HCN( J = 3–2)).