The incompleteness of the known PHO population (MOID <0.05 au, H < 22). For the a, e, and i distributions, the dashed lines show the number of known PHOs with H < 22, and the solid lines are the number of PHOs with H < 22 inferred from our maximum likelihood base model (both given per bin interval; 0.1 au, 0.°04 and 4°). For the H distribution in the bottom-right panel, we show both the cumulative and differential (per 0.25 mag) distributions (upper and lower lines, respectively; solid for model, dashed for known). The uncertainty of the cumulative population estimates increases from ≃3% for H < 20 to ≃6% for H < 25. The uncertainties were obtained from the posterior distribution produced by MultiNest and do not account for various uncertainties of the CSS detection efficiency.