Left: recovery fractions for the simulated sources in SPTCL-2106. Middle: same for MOO-1014. Right: same for the XDF reference field, with noise level matched to the cluster fields. The colour bar shows the recovery fractions. While the detection limits are comparable between the panels, the XDF shows overall a better recovery fraction for brighter targets than in the clusters due to a higher source crowding in the cluster fields. We also highlight the regime of objects with a surface brightness from 24.0 to 26.5 mag arcsec⁻² in F140W and a radius from 1.5 to 7.0 kpc.