CH₃C₂H 5₀ → 4₀ velocity fieldclipped at the 5σ level. Unlike in Figs. 8 and 9, the emission is confined to the nuclear disk. Primary beam correction and Briggs weighting (robustness parameter +2.0) has been applied. The contours start at 470 km s⁻¹ and reach 695 km s⁻¹; their spacingis 25 km s⁻¹. The restoredbeam (2.′′65 × 2.′′ 28, PA = 80°) is shown in the lower left corner of the image. The cross indicates the λ ≈ 3 mm radio continuum peak.