HST WFC3/IR (F125W) image of the QSO LBQS 0302−0019 in comparison to ground-based adaptive-optics-assisted VLT/HAWK-I (K_s) imaging. Left panel: WFC3 image after combination of all frames taken in the IRSUB256 sub-aperture. North is up, and east is to the left. Right panels: zoomed-in view on the central 13″ × 13″ around the QSO in the HST (top) and HAWK-I (bottom) images from Paper II before (left) and after (right) QSO subtraction. Four close neighbouring galaxies are consistently seen in both filters and are annotated as Jil1-4.