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- astrophysics28
- bl lacertae objects14
- fos: physical sciences11
- astrophysics - cosmology and nongalactic astrophysics10
- astrophysics::cosmology and extragalactic astrophysics10
- astrophysics::galaxy astrophysics9
- astrophysics::high energy astrophysical phenomena9
- galaxies: active9
- astrophysics - high energy astrophysical phenomena8