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    Active galactic nuclei (1)
    Background radiation (1)
    BL lacertae objects (1)
    BL Lacertae objects: individual (Markarian 421) (1)
    Correlated variability (1)
    Electron acceleration (1)
    Gamma rays (1)
    Gamma rays: general (1)
    LAC objects (1)
    Large area telescope (1)