Flowchart illustrating the selection of all samples considered in this work. Below the sample name (bold face) we list the sample size for each PS1 band in the order g_P1, r_P1, i_P1, z_P1. We also state the defining properties of each sample, such as objects with known AGN type, spectroscopic redshift (spec-z), black hole mass (MBH), bolometric luminosity (L_bol), or objects within a certain redshift range (see text for details). The two rightmost samples are introduced in Sect. 5.3.