Source magnitude vs. magnitude error for the IRAC-selected multi-band catalog produced using The Tractor to perform forced photometry. The 5σ magnitude limit corresponds to a magnitude error of 0.2 (horizontal green line). For each band, we identify the faintest source magnitude at the intersection with the 5σ limit (vertical green line). We provide the value of the 5σ detection threshold for each band in the upper left corner of each plot.