Fig. 6.
Quasar colors versus redshift for different quasar samples between z = 1.4 and z = 5.5. Red points: RSQs with photometric redshifts; purple points: Boötes spectroscopic quasars; black contours and points: color distributions of the quasar training sample from Sect. 2.3; blue lines: mean color–redshift relations derived from the quasar training sample.
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