Stellar mass versus redshift (left) and stellar mass histogram (right) for ALPINE continuum non-target detections. The black filled circles and blue filled histogram show the distribution of the whole sample, while the orange circles and histogram show the locus occupied by the HST+near-IR dark sources. The cyan open squares and dashed-histogram show, for comparison, the locus of the sources identified with [C II] emitters at the same redshift of the ALPINE targets (we note that the two without photometric counterparts are missing, since for them a mass estimate was impossible).