Open Access
Fig. 8.
GLPS obtained using the monthly light curves of PKS 0447−439 is shown in cyan (circles); the red solid line, green line, and orange line represent the 3σ, 2.5σ, and 2σ confidence levels, respectively, calculated based on simulations of 50 000 light curves using the method of Timmer & Koenig (1995).
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