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- astrophysics - high energy astrophysical phenomena128
- astrophysics - astrophysics of galaxies30
- galaxies: active21
- galaxies: jets21
- bl lacertae objects19
- fos: physical sciences19
- astrophysics - cosmology and nongalactic astrophysics18
- high energy astrophysical phenomena (astro-ph.he)18
- astrophysics - instrumentation and methods for astrophysics16