PSF subtraction procedure for J0313–1806. Left: Integrated white-light image of the reduced cube centered on J0313–1806. The blue cross marks the position of the unresolved quasar. Center: Integrated and scaled cube of the PSF calibration star TYC 5875-488-1, aligned and scaled to match the quasar emission. The orange cross marks the position of the unresolved star. Right: Residual white-light image of J0313–1806 after PSF subtraction, revealing extended emission components after removal of the unresolved quasar core. We highlight three regions of interest: (A) A bright core near the quasar, (B) a near-elliptical diffuse region just northeast of the quasar, and (C) a distinct foreground elliptical source to the southwest of the quasar. This work focuses on the central region (A). For all maps, pixels with negative integrated flux were masked.