Fig. 1.
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Synchrotron peak frequency as a function of 0.2–12 keV flux for the 1007 blazars with X-ray counterpart and without a counterpart in the 4FGL catalogue (Marchesi et al. 2025). The subsample of sources analysed in this work is plotted in orange; the three FSRQs excluded from the analysis are instead plotted in green. Finally, the rest of the Marchesi et al. (2025) sample is shown in blue.
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