Probability density of black hole masses for log L_bol = 45.2 [erg s⁻¹] at z = 0. The pink line shows the model median distribution with the 95% credible region, while the histogram shows the observational data on Type 1 AGN gathered from Baron & Ménard (2019). The grey vertical lines show where the Eddington ratio reaches 0.01 and 1, which marks the boundaries where we expect additional effects to play a role that are not included in the model. The grey dotted line is the expected distribution calculated from the MAP parameter estimates when invoking a hard cutoff outside of these boundaries. Doing so decreases the mismatch between the distribution means from 0.5 dex to 0.3 dex compared to the observational sample. The black lines mark the 95% credible region for the observational bins, based on the uncertainties in the black hole masses.