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- astrophysics - instrumentation and methods for astrophysics27
- astrophysics - cosmology and nongalactic astrophysics17
- astrophysics - high energy astrophysical phenomena11
- fos: physical sciences10
- cosmology: observations8
- astrophysics7
- instrumentation and methods for astrophysics (astro-ph.im)7
- astrophysics::cosmology and extragalactic astrophysics6
- galaxies6