Position velocity (pV) diagrams of HCN-VIB and HCN 3–2. Colours indicate HCN-VIB and greyscale indicates HCN 3–2 emission – both range from 1 to 6.5 mJy beam⁻¹. The contour range is 1.2 × ( − 9, −7, −5, −3, −1, 1, 3). HCN 3–2 absorption is indicated by negative, dashed contour lines. Top panel: cut is along the north–south (PA = 0°) major axis of the nuclear disk. The black dashed line indicates the intensity weighted rotational velocity within r = 10 pc. Lower panel: cut is along the east–west (PA = 90°) minor axis of the nuclear disk. The ν_sys of 3880 km s⁻¹ is indicated with a vertical black line. The position of the band 6 continuum is indicated by a horizontal black line.