Velocity-integrated molecular line intensity ratios for NGC 1068 above a ⩾1σ threshold. The white cross marks the position of the millimeter continuum emission that is associated with the AGN. The different line ratios are: (a) ¹²CO( J = 3–2)-to- ¹²CO( J = 1–0); (b) ¹²CO( J = 3–2)-to- ¹²CO( J = 2–1); (c) ¹²CO( J = 2–1)-to- ¹²CO( J = 1–0); (d) ¹²CO( J = 3–2)-to- ¹³CO( J = 3–2); (e) HCN( J = 3–2)-to- ¹²CO( J = 3–2); (f) HCO ⁺( J = 3–2)-to- ¹²CO( J = 3–2); (g) HCN( J = 3–2)-to-HCO ⁺( J = 3–2); (h) HCO ⁺( J = 3–2)-to-HCO ⁺( J = 4–3); (i) ¹³CO( J = 2–1)-to- ¹²CO( J = 2–1); (j) ¹³CO( J = 2–1)-to-HCN( J = 3–2); (k) ¹³CO( J = 2–1)-to-HCO ⁺( J = 3–2); (l) ¹³CO( J = 2–1)-to-C ¹⁸O( J = 2–1); (m) ¹³CO( J = 1–0)-to- ¹³CO( J = 2–1); (n) ¹³CO( J = 1–0)-to- ¹³CO( J = 1–0); (o) ¹³CO( J = 2–1)-to- ¹³CO( J = 3–2) and (p) ¹³CO( J = 1–0)-to- ¹²CO( J = 1–0).