Left: 2D maps of the [Fe ii] 1.64 μm velocity centroid deduced from one component Gaussian fitting of the line profile. Redshifted velocities are shown on a negative scale to better highlight the velocity asymmetry between them. Spectra with SNR lower than 5 were masked. The cross marks the location of the continuum. Contours show the sum of the deconvolved HV and MV channel maps. Right: PV diagram of [Fe ii] along the jet, averaged over across the jet, with velocity centroids indicated as crosses. Horizontal dash-dotted lines indicate the region where residual noise after continuum subtraction is still large. Contours start at 2.43 × 10^-15 W m^-2 μm^-1 arcsec^-2 and increase by factors of . The 3σ contour is shown as a dotted line.