High-frequency predictions for number counts and spectral properties of extragalactic radio sources. New evidence of a break at mm wavelengths in spectra of bright blazar sources

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Fig. 4

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Left panel: distributions of 1–5 GHz (solid line) and 5–20 GHz (dashed line) spectral indices of steep-spectrum sources selected from the AT20G catalogue. Right panel: distribution of the difference . The thin line is the Gaussian fit.

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