Fig. 8
Distribution of αR−O(Thermal) for all the sources and for each blazar sample. Only SEDs with good or excellent optical data (flag = 2 or 3, see text) were used. Black solid histograms: radio sample; red dashed histograms: Fermi sample; green dot-dashed histograms: Swift BAT sample; blue dotted histograms: RASS sample. Distributions for BL Lac objects refer to upper limits only.
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