Fig. 3.
Top: distribution of α of quasars calculated using LOFAR and FIRST flux densities. The distribution is shown for quasars detected by both LOFAR and FIRST, separately for optically selected and radio selected quasars. Bottom: the distribution of α of optically, radio selected and objects presenting extended structures. Optimal bin widths were selected using the Knuth rule (Deeming 1975; Ivezić et al. 2014).
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