Distribution of the key properties of the QSOFEED sample. From top to bottom, the panels show the distribution in redshift of the sample, in stellar masses of the host galaxies taken from Pierce et al. (2023), in bolometric luminosities, and in 1.4 GHz radio luminosities. Only objects that have either FIRST or NVSS detections are included in the bottom panel and upper limits are given in Table A.1. The mean value for each property is given in the individual panels.