Distribution of the r-band aperture magnitudes (see the descriptions of columns 135–139 in Appendices A and B for more details on the measurements). The blue histogram is the distribution of all HETDEX AGN with coverage from the four r-band imaging surveys that we have searched. The orange histogram includes only those HETDEX AGN with secure redshifts. The green histogram is the distribution of the full SDSS DR14Q catalog. The red dashed vertical line at r = 22.5 roughly shows the flux limit of the SDSS.