Redshift distribution of line-detected galaxies. The photometric survey can be used to identify galaxies to follow-up in spectroscopy. We show the redshift distribution of galaxies with [O IV]26 μm and [Ne II]13 μm lines above 10⁻¹⁹ W/m² (blue histogram) with the subsamples detected in the Deep and Wide surveys (hatched histograms), considering the conservative depths. The grey area shows the redshift range in which [O IV]26 μm and [Ne II]13 μm lines are in the PRIMA/FIRESS wavelength coverage, but other lines can be used at z < 0.8 to derive SFR and BHAR.