Extinction traced by the ALMA and MUSE data. Left panels: CO(2-1) molecular gas emission from ALMA. Right panels: extinction map derived from the MUSE Hβ/Hα ratio. Bottom panels: zoom-in into the central region, where the white lines mark the position of the features discussed in Sect. 6. The contours in the top right panel indicate CO(2-1) emission at 5 (white) and 15 (black) K km s⁻¹ (corresponding to Σ_mol ∼ 30 and 100 M_⊙ pc⁻²); the black contours in the bottom right panel range from 90 to 800 K km s⁻¹ in steps of ∼90 (corresponding to Σ_mol ∼ 600−5350 M_⊙ pc⁻²).