Fig. 6
Global significances for the peaks in the periodogram obtained linearly adding the γ-ray and optical PDSs of BL Lac. The Lomb-Scargle spectrum is given in blue. Solid and dashed lines indicate PL and AR1 models, respectively. Red, purple and yellow lines are the best-fit noise spectrum, 95.0% and 99.7% false alarm levels, respectively.
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