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Fig. 11
Average Fermi-LAT γ-ray photon spectral index of all HSPs in our sample detected by Fermi-LAT, binned in four intervals of log(νpeak), is plotted as a function of log(νpeak). The best-fit line corresponds to ΓFermi − LAT = -0.051 Log(νpeak) + 2.67.
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