Sky distribution of the final RACS sample together with the area covered by each optical/NIR survey considered and by the RACS-low survey (delimited by the dashed line). The overall area covers ∼16 000 deg² at |b|> 15°. The stars indicate the z > 5 sample (darker colour for the quasars already known in the literature and lighter for the new ones reported here), while the squares are the newly discovered sources at 4.5 < z < 5.