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active galactic nuclei (2) |
base-line array (1) |
blazars (1) |
crab-nebula (1) |
galaxies: active (2) |
galaxies: individual (bl lacertae, ver j2202+422) (1) |
galaxies: individual (m 87) (1) |
galaxies: jets (1) |
galaxies: nuclei (1) |
gamma rays: galaxies (2) |