ALMA Band 7 continuum emission and H₂O absorption. Top panel: ALMA band-7 continuum emission. Contours are in steps of 5 × (σ = 0.25 mJy beam⁻¹). Centre panel: H₂O 3_3,0 − 3_2,1 and H₂O 4_2,3 − 4_1,4 absorption profiles for the northern (strongest) lensed image. The CO-derived redshift of the host galaxy is denoted by a vertical line. Bottom panel: H₂O 3_3,0 − 3_2,1 and H₂O 4_2,3 − 4_1,4 absorption profiles for the southeastern lensed image. The RMS noise level spectra are shown as shaded areas.