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Fig. 3

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The Fermi-LAT γ-ray flux of the sources in our samples detected during the simultaneous integration with Planck is plotted against the flux reported in the Fermi-LAT 1-year catalog. The three solid lines represent equal fluxes (i.e., no variation) and a factor of two variability above or below the equal flux level. Note that several points are outside the factor of two variability lines, revealing variability of up to about a factor ten.

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