Fit of the line profile of the H₂ 2.122 μm line (FWHM_in  =  49 ± 11 km s⁻¹) integrated over the central region using a Moffat function (solid black line). The peak of the emission profile is redshifted by ∼5  ±  2.7 km s⁻¹ with respect to the system velocity of ∼3 km s⁻¹ (dashed vertical line). The S/N computed for each position is indicated with a cross. The S/N scale is shown on the right y-axis, and the dashed horizontal line indicates the zero level.