Results from the NIRCam PSF subtraction for J1120+0641. From left to right, the original NIRCam images, the PSF-subtracted images, the model for the host and the companion, the image fitting residual (i.e. the subtraction of the full model from the original image), the PSF-subtracted images divided by the error images, and the residual images divided by the error images. The extended emission is modelled as two Sérsic profiles using the positions and morphologies as measured from the [O III] λ5007 maps (Section 3.1). The PSF-subtracted images clearly show the extended emission around the quasar.