Comparison between The Tractor and original photometry. For SERVS, we converted the aperture-corrected fluxes measured within an aperture of radius 1.″9 from the original catalog to AB magnitudes. For VIDEO, we show the Petrosian magnitudes. For CFHTLS-D1, we show the MAG_AUTO magnitudes, which are measured within an elliptical aperture similar to that defined in Kron (1980). The dashed line shows the one-to-one correspondence between The Tractor and original catalog magnitudes. Blended sources in SERVS identified based on the presence of a nearby source in the VIDEO catalog within 3.″8 are shown in red. Sources lacking neighbors in VIDEO within 3.″8 that were modeled as point sources and, therefore, known to be free of blending issues in SERVS are shown in green. The purple symbols trace all sources. This includes clearly blended/non-blended sources and sources that were modeled with a resolved surface brightness profile. The gray-shaded region highlights the parameter space below the average 5σ detection threshold of each survey.