Fig. 3
From left to right, PDS of 0716+714, MRK 421, and BL Lac from the 100 MeV–300 GeV Fermi light curves, from Aug. 2008 to Jan. 2016. Lomb-Scargle spectrum of the input time-series data is given in blue and the best fit noise spectrum in red. Single frequency 95.0% and 99.7% false alarm levels are reported by purple and yellow lines. Solid and dashed lines refer to PL and AR1 models, respectively.
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