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- astronomy & astrophysics139
- cosmic background radiation131
- astronomical and space sciences113
- astro-ph.co112
- astrophysics::cosmology and extragalactic astrophysics95
- astrophysics - cosmology and nongalactic astrophysics79
- cosmology: observations67
- methods: data analysis62
- astrophysics::instrumentation and methods for astrophysics59