Bias on source properties as a function of the minimum Einstein radius. First panel: median source redshift. Second panel: median source magnitude. Third panel: median half-light radius in the magnitude bin 24.8 < m_s < 25.2. Fourth panel: median Sérsic index in the magnitude bin 24.8 < m_s < 25.2. Fifth panel: median axis ratio. In each panel, the dashed line indicates the value of the population of detectable sources. Error bars indicate the standard deviation of the mean of either the full sample (first, second, and fifth panel) or the bin (third and fourth panel).