Fig. 28.
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Distribution of the 1.4–3.0 GHz spectral index for the 17 399 radio counterparts of the GLEAN variable AGN (red) for the 2058 of them that are included in the BZCAT5 catalogue of confirmed blazars (green), and for the 4209 blazar candidates in the BROS catalogue (blue). The vertical line indicates the value 0.5 below which a radio spectrum is defined as ‘flat’.
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