Primary beam corrected HCN J = 1 → 0 emission (Briggs weighting with a robustness parameter of 0.0) integrated over the velocity interval 585–612 km s⁻¹, the near systemic velocity range, where nuclear absorption is not as strong as at adjacent velocities. The arms (mainly green, see Sect. 4.7) are visible in the northwest and southeast, likely connected by the elongated region of strong emission along an east-west axis. See Fig. 22 for an even clearer image, where absorption plays a lesser role.