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Fig. 2
Fermi-LAT lightcurve of the source 1FGL1635.4+8228, associated with the radio galaxy NGC 6251, between 100 MeV and 100 GeV. The time is measured from 2008 August 4 and covers 15 months of Fermi operation. Each bin corresponds to 3 months of observations. The horizontal line is the constant flux.
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