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- astrophysics - astrophysics of galaxies99
- astrophysics - high energy astrophysical phenomena79
- active galactic nuclei57
- galaxies: active47
- vitrectomy31
- fos: physical sciences29
- astrophysics::cosmology and extragalactic astrophysics24
- astrophysics::galaxy astrophysics23
- astrophysics::high energy astrophysical phenomena23