Fig. 1
Flux light curves of PKS2155−304 (top panel) and PG1553+113 (bottom panel). Fermi light curves in the 100 MeV–300 GeV energy range (7-day and 20-day binned, respectively) are reported. The combined nightly averaged R-band data are also given. The light curves are not host galaxy subtracted. In the optical light curves error bars are in most cases smaller than symbol size.
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