Redshift distribution of galaxies observed by PRIMAger. The proposed PRIMAger surveys will not be limited to only the brightest IR galaxies. We show the number of galaxies as a function of redshift for the Deep (top, 1500 h/deg²) and Wide (bottom, 150 h/deg²) surveys using the SPRITZ simulation. We consider only galaxies with S/N ≥ 5 in at least 6 out of 12 PRIMAger Hyperspectra filters (i.e. PHI1–PHI2 in Table 1). The black solid lines show the total redshift distributions considering the payload depths.