Maps of integrated CO emission for the four detected transitions (the continuum was not subtracteddue to its very low level of emission). Top: NOEMA observations, from left to right: ¹²CO J = 2 → 1 (first contour at 5σ, second contour at 15σ, then 15σ spacing withσ = 31 mJy beam⁻¹ km s⁻¹), and ¹³CO J = 2 → 1 with 3σ spacing contours, σ = 23 mJy beam⁻¹ km s⁻¹. Dotted lines show negative contours in steps of 3σ. Bottom:ALMA observations, from left to right: ¹²CO J = 3 → 2 with uniform weighting to highlight the central gas cavity (3σ spacing, σ = 40 mJy beam⁻¹ km s⁻¹), and ¹³CO J = 1 → 0 1σ spacing contours starting at 2σ (for positive and negative contours), σ = 6.8 mJy beam⁻¹ km s⁻¹.