Comparison between the real injected AGN contribution fraction and the AGN contribution fraction obtained from GALFIT fitting, obtained by dividing the PSF flux by the total flux. Left: Total flux corresponds to the flux measured within a 2″aperture in the original image. Right: Flux measured within a 2″aperture in the model (Sérsic+PSF). In both cases, the PSF flux was measured within the same aperture in the model PSF image. The dispersion in the left panel corresponds to RMSE = 0.12, and in the right, RMSE = 0.17. The colour bar provides the number of sources in each 2D bin.