Velocity maps of the ionised gas in the GS_4891 system obtained from the fitting of the [O III] λ5007 and Hα lines. The three left panels show the velocities at the 2nd, 50th, and 98th percentiles of the velocity distributions. The right panel shows the W80 map. The black cross indicates the centroid of continuum emission, whereas the dashed black contours correspond to the Hα emission.