Flux from the background-subtracted data cube integrated across 0.82–5.2 μm (left) and the [O III] λ 5007 flux map after quasar subtraction (right). The fluxes in each spaxel are as indicated in the respective colour bars. Purple to white contours show the quasar-subtracted HST/WFC3 F125W surface brightness (Marshall et al. 2020, who found very similar F160W morphology). Dark purple, light purple, and white correspond to 24.75, 24.00, and 23.25 mag arcsec⁻¹, respectively. Four regions are marked by green elliptical apertures: region 1 is the north-eastern companion galaxy, region 2 is a bridge of connecting gas, the quasar host-galaxy is region 3, and region 4 is the south-eastern companion galaxy. The maps are aligned along the cardinal directions, with north upwards and east to the left.