Same as Figure  4, but including cumulative counts of Hα , [O iii], and [O ii] foregrounds from the COSMOS Survey catalog of Takahashi et al. (2007), with fits to Schechter functions made by us for extrapolation fainter than F = 10 ⁻¹⁷ erg s ⁻¹ cm ⁻². As before, the "ALL" line is the sum of SEL and Em+C sources. (The adopted incompleteness correction described in Section 4 has been applied. The vertical bar marks the 50% incompleteness at F = 3.5 × 10 ⁻¹⁸ erg s ⁻¹ cm ⁻²: at this point the cumulative "ALL" counts are greater by 7.0% than for an uncorrected distribution.) The "COSMOS" line is the sum of these three expected foreground interlopers, as explained in the text. Since the "ALL" line of our 2008 survey is a sum of foreground sources and LAEs at z = 5.7, if the extrapolated foreground of the COSMOS data accurately represents all foreground objects, then its difference from the "ALL" line of our search should be due entirely to LAEs.