Fig. 4
Fermi-LAT long-term light curve of PKS 0447−439 showing the photon flux integrated between 0.1 GeV and 200 GeV in intervals of 90 days. The horizontal error bars indicate the duration of the intervals. The period chosen for the extraction of the Fermi-LAT spectrum is indicated by the large blue band. The thin, striped band corresponds to the H.E.S.S. observational period in December 2009.
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