Histograms for sources detected in g, but not detected in K_s for template sample with models. (a) Histogram showing the dN/d log S_X distribution of the template sample of X-ray sources that are detected in HSC g-band, but not in CFHT K_s (depth matched with AKARI NEP Deep Field; See text), constructed from the COSMOS Legacy survey. The curve shows the best-fit model. (b, c) Histograms of log S_X + 0.4 g distribution of the template sample and the best-fit model.