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Fig. F.1.
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Long-term γ-ray light curve of BL Lac over 2009–2023 (top). Zoom-in view of the strongest flare is presented (bottom). The red vertical line denotes the observing date of the GMVA observation on 24 April 2021. The green shaded area shows a zoom-in view of the γ-rays near the GMVA observation.
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