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- astrophysics42
- astrophysics - high energy astrophysical phenomena27
- astrophysics::high energy astrophysical phenomena24
- bl lacertae objects21
- fos: physical sciences21
- astrophysics - cosmology and nongalactic astrophysics19
- astrophysics::cosmology and extragalactic astrophysics16
- galaxies: active15
- physics15