(Top row) Selection functions for the F225W, F275W, and F336W dropout criteria shown as a function of redshift (top panel) and as a function of both redshift and absolute rest-frame UV magnitude (bottom panel). This shows the redshift and absolute rest-frame UV magnitude distributions of galaxies selected by the dropout criteria. The relative efficiency is the fraction of sources that are selected from the full input sample after applying the selection cuts. (Bottom row) Selection functions for the photometric redshift samples corresponding to the redshift selected with the dropout criteria. Requiring a 5σ detection in the observed rest-frame UV magnitude and applying the cuts to ensure good quality photometric redshifts (ODDS ﹩\gt \,0.9﹩ and modified reduced ﹩{\chi }^{2}\lt 1.0﹩) are the primary factors affecting the relative efficiency of these selection functions.