Spatial number densities, excluding the unsafe inference subset, for KiDS QSO candidates. Two bottom lines compare the KiDS QSO candidates to the SDSS spectroscopic QSOs at the SDSS completeness range of 16 < r < 19. The three upper lines show the final QSO catalog at progressing magnitude limits with the suggested probability cuts. We chose a magnitude limit for the middle line at r < 23.5, as above this limit the distribution of QSO candidates gains another peak at redshift z < 1.5.