Line profiles from the nuclear region (r = 1″ aperture). Left panel: fine-structure lines, and middle and right panels: H₂ S(7) to S(4) and S(3) to S(1) transitions, respectively. The 0 km s⁻¹ value corresponds to the adopted z = 0.004217. Note that the red part of the H₂ S(6) line profile (green line, middle panel) is inside one of the H₂O molecular absorptions. We did not apply the 1D residual fringe correction.