427.8 GHz continuum emission; moments 0, 1, and 2 for 13CO J = 4 → 3; and moment 0 of HCN J = 5 → 4. A moment 0 contour of 8 Jy/beam km s−1 of 13CO J = 4 → 3 is shown in black in all images to highlight the nuclei. A systemic velocity of 5338 km s−1 is assumed for moment 1.