Overview of the kinematics derived from ACES HNCO (4–3) emission across the M0.8–0.2 ring. Top: intensity-weighted centroid velocity integrated between −5 km s⁻¹ and 75 km s⁻¹ (velocity range of the ring-like structure; see also the channel maps in Fig. C). Bottom: spectrum of HNCO (4–3) averaged across the ring-like structure (solid blue line). Overlaid as a solid grey line is the single-component Gaussian model fitted to the emission between −5 km s⁻¹ and 75 km s⁻¹, and in faded blue is the residual of the fit. We do not consider the lower (−25 km s⁻¹) and higher (75 to 110 km s⁻¹) velocity components to be associated with the ring-like structure (see Sect. 3.1).