Inverse of the signal-to-noise as a function of line flux for an infinite EW line in J and at peak transmittance of NB118 filter 15. Curves are shown both for exposure times as in the UltraVISTA DR2 (blue) and for the final UltraVISTA survey (red). Moreover, for the NB118 filter, results are included both for the typical per pixel integration time (alone) and for half this value (overlap) (cf. Sect. 5.1).