Summary of the spatial configuration. The QSO location is marked by the plus sign ( + ). The location of the [O iii] emission is marked by a green asterisk. The red and blue dotted polygons illustrate the spatial FWHM for the red and blue peaks (see Fig. 10) as shown in Fig. 11. The spatial FWHM extent of Ly α peaks is then fitted with ellipses. Triangulating the impact parameters for each PA provides the location of the centroids ( × ). Solid black lines represent the layout of the three slits. Top and right axis provide the physical projected distance in proper units at z = 2.207.