Histograms of the probability that a source belongs to the galaxy class. The histograms for actual stars and galaxies as classified by SDSS (top) and HSC-SSP (bottom) are plotted in blue and semi-transparent red, respectively. The panels on the left use only photometric information, and those on the right also use morphology. For comparison we also show the classification by CLASS_STAR and SGLC, which always use morphological parameters.