Fig. 5
Left panel: PDS of BL Lac from the 100 MeV–300 GeV Fermi light curve 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. Global 95.0% and 99.7% false alarm levels are shown with purple and yellow lines. Solid and dashed lines indicate PL and AR1 models, respectively. Right panel: as above from the R-band light curve.
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