Fig. 1
a) Weekly (blue circles) and monthly (red open symbols) averaged flux (E > 100 MeV) light curves of 3C 273 measured by Fermi-LAT since its launch. The green histogram represents the arrival time distribution of E > 10 GeV photons associated with 3C 273. The yellow box represents the high γ-ray flux activity period. b) One-day averaged light curve of the source over the high-activity period within the box shown at the top of the figure.
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