Normalized density of sources detected by the HSC pipeline averaged around samples of bright stars for decreasing star brightness (from left to right and top to bottom). The blue curve shows all the parent sources (unique or before deblending), whereas the green curve shows all the primary sources (unique or after deblending, i.e., the children). The blue dashed line is the best-fit error function to the blue curve. The black arrow shows the final mask radius. (Color online)