Light curve of the Crab in the range 0.1–300 GeV with 12 h time bins. The green dashed line indicates the flux of the Crab estimated over all the Fermi operation period. The green solid line is the average flux between September 19 and 21, as reported by Buehler et al. (2010). The red lines represent the average flux before and during the flares (see Table 1). The time is expressed in Modified Julian Date.
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