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| active galaxy markarian-421 (1) |
| bl lacertae objects : individual (markarian 421, markarian 501) (1) |
| galaxies : active (1) |
| gamma rays : observations (1) |
| photons (1) |
| radiation (1) |
| active galaxy markarian-421 (1) |
| bl lacertae objects : individual (markarian 421, markarian 501) (1) |
| galaxies : active (1) |
| gamma rays : observations (1) |
| photons (1) |
| radiation (1) |