Position-velocity slice through the data cubes along the major axis of rotation. The top-left image shows the integrated flux map of the HCN 3–2 transition. The dashed red region shows the 07 by 003 slice through each data cube. The contours show 3, 6, 12, 24, and 48 times ±0.3 mJy. We adopt line identifications from Sakamoto et al. (2021), represented by horizontal black dashed lines; they show the systemic velocity of the indicated transitions. The velocity axis is shown in the optical convention utilizing the rest frequency of the HCN 3–2, CH₂NH 6–5, and HCO⁺ 3–2 transitions. The vertical dashed black lines indicate the angular offset between the brightest redshifted and blueshifted velocity components.