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Fig. 19

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The γ-ray spectral index, estimated from the entire 27-month Fermi-LAT data set of all sources in our samples is plotted against log(). Gray points, plotted without statistical errors to avoid confusion, represent the Fermi-LAT spectral slopes estimated using the 2-month integrations. The solid line is the best-fit given by Abdo et al. (2010a).

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