Mean-velocity fields derived from the CO(2–1) (left panel), CO(3–2) (middle panel) and HCO⁺(4–3) (right panel) lines in the central (≃20 pc) region around the central engine of NGC 1068. Isovelocity contours and color scale span the range [−100, 100] km s⁻¹ relative to km s⁻¹ in steps of 10 km s⁻¹. The yellow filled ellipses in the bottom right corners of the panels represent the beam sizes of ALMA.