Left panel: three color image of the flux for the three [O II] radial velocity components: red is the [O II]λ3729 redshifted component, green is the [O II]λ3729 main component, and blue is the [O II]λ3726 blueshifted component. Right panel: zoom on the white box from the left panel showing the main radial velocity component in grayscale with the redshifted component as contours.