Fig. A.1.
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Radio spectra of the 29 quasars with z > 3.5. Considering the relatively large errors of the GLEAM data (small red circles) we provide flux densities by rebinning five frequency channels (large black circles). The other flux densities are from the NVSS (black squares), FIRST (red squares), VLASS (red triangles), and GB6 (black triangles).
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