Renormalized histograms of S90 fluxes of AKARI FIS sources. The dotted line corresponds to the sources from the complete sample. Sources from the masked areas, i.e. areas with Galactic cirrus emission lower than 5 MJy sr−1 and scanned by AKARI at least three times, are denoted by solid line. Sources from the masked area, selected as galaxy candidates by our far infrared color-based criterion, are shown by the dashed line.