Differential LFs for sources in a 0 7 radius circle surrounding the search field position. There are 2323 sources in the O ii sample, 1491 O iii sources, and 600 Hα sources within the 0 7 circle that have been used for fitting luminosity functions (see the text). Slope values of −1.30, −1.60, and −1.60, respectively, have been used to extrapolate the expected number of foreground galaxies down to F = 2.5 × 10 ⁻¹⁸ erg s ⁻¹ cm ⁻². The corresponding values of L* in erg s ⁻¹ and log Φ in Mpc ⁻³(Δlog L) ⁻¹ are recorded.