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Facility
- CHANDRA183
- RADIO CATALOG162
- ROSAT133
- STAR CATALOG106
- XMM-NEWTON99
- HST83
- GALAXY CATALOG79
- ISO33
- INTEGRAL30
- EINSTEIN26
- CGRO25
- XMM25
- GAMMA-RAY BURSTS24
- AKARI23
- Chandra22
- Spitzer22
- Einstein21
- FERMI21
- SWIFT21
- Swift20