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Fig. 9.
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Radio luminosity at rest-frame 5 GHz versus optical luminosity at rest-frame 4400 Å for the high-z quasar sample. The radio-loud criterion is defined as R = fν,5 GHz/fν,4400 Å > 10 in line with other work, leading to a radio-loud fraction of this sample of ∼10% if assuming the non-detected quasars are radio-quiet.
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