Original (top) and PSF-subtracted (bottom) images of the QSO LBQS 0302−0019 and its close neighbouring galaxies as observed from space- and ground-based telescopes. In the left panels, we show the HST WFC3 near-infrared images from Husemann et al. (2021), with contours in the bottom panel showing the Jil1-to-4 galaxies discovered by Husemann et al. The middle panels present the MUSE Lyα emission before (top) and after (bottom) the QSO PSF subtraction, from Husemann et al. (2018a), with contours from the PSF-subtracted HST image. The right panels show the [O III] λ5007 emission from JWST/NIRSpec observations; see Sect. 5.3 for details on the QSO PSF subtraction. North is up, and east is to the left.