Redshift distribution of ALPINE non-target sources detected in continuum with an identification (green-filled black histogram in the top panel, empty in the bottom panel). Top panel: the deep-pink histogram shows the five sources detected in [C II] at the same redshift of the ALPINE central targets, while the blue-dashed histogram shows the redshifts of the 47 sources considered for the unbiased LF calculation (i.e. excluding the five [C II] emitters). Bottom panel: the latter distribution is shown in blue, while the best fit photometric redshifts of the six HST+near-IR dark galaxies are shown as a red and orange-filled histogram.