ALMA maps of the continuum at 454 GHz (660 μm, panel a), and of the integrated intensity (moment 0, panel b), velocity field (moment 1, panel c), and velocity dispersion (moment 2, panel d) of the H₂O448 line. North is up and east is left. The rms noise is 1.4 mJy beam⁻¹ in panel a and 0.8 Jy km s⁻¹ beam⁻¹ in panel b. Contours are 4.5 (≈3σ), 20, 40, 60, and 80 mJy beam⁻¹ in panel a, and 2.5 (≈3σ), 5, 10, and 20 Jy km s⁻¹ beam⁻¹ in panel b. The hatched ellipses indicate the synthesized beam.