Illustration of the UKIDSS total magnitude estimator adopted in the S82-MGC. For sources classified as galaxies we plot K-band results in this figure, but the other bands are similar. Here CModelMag refers to the UKIDSS aperture magnitude corrected by the difference between the z-band synthetic aperture and the z-band CModelMag. Blended sources are highlighted in purple and fall off sharply beyond the detection limit (∼19.5). In the top panel, the Hall magnitudes are fainter than CModelMag for bright galaxies. The green curve is a fit to this trend. In the bottom panel, we have corrected the Hall mags of isolated sources using this fit and substituted the CModelMag value for blended sources. This plot of the Hall mag as the dependent variable confirms that there are no biases in the total flux estimator above the detection limit.