Expected number of Hα emitters in the part of the UltraVISTA NB118 field with data from two different NB118 filters as a function of line luminosity. Predicted curves are included both for the UltraVISTA DR2 (blue) and the final UltraVISTA (red) for three different z = 0.8Hα LFs from the literature. Results are plotted for the assumption of w₆₅₈₃ = 0.3 in all three cases. In the case of the Ly et al. (2011) LF, the curve for w₆₅₈₃ = 0 is also shown. Small arrows indicate luminosities corresponding to line fluxes of 3.0, 5.0, 10.0, and 20.0 × 10^-17 erg s^-1 cm^-2. The integrated numbers for objects brighter than the respective marked fluxes are stated in Table C.1.