Number counts of PHZ sources in the 857-, 545-, 353-, and 217-GHz bands (from left to right, respectively), where the flux densities have been computed in the cleaned maps and may be affected by the attenuation effect. Three cases are presented, depending on the assumption made about the intrinsic number of objects composing the PHZ source: n = 1 (red); n = 3 (orange); and n = 30 (blue). The vertical dash-dot-dot-dotted lines provide the 80% completeness limit of the PHZ catalogue at each frequency, estimated from Monte Carlo quality assessment (MCQA) simulations. The predictions of the Béthermin et al. (2012) model integrated between redshift 1.5 and 4 are shown for three populations of sources: main sequence (dotted line); starburst (dashed line); and lensed (dot-dash line).