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- gamma rays: galaxies (4)
- galaxies: active (3)
- BL Lacertae objects: general (2)
- BL Lacertae objects: individual: Mrk 421 (2)
- gamma rays: general (2)
- radiation mechanisms: non-thermal (2)
- Air showers (1)
- BL Lacertae objects: individual (1ES 1959+650) (1)
- BL Lacertae objects: individual (B2 1215+30, VER J1217+301) (1)
- BL Lacertae objects: individual: Markarian 501 (1)