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The SAO/NASA Astrophysics Data System (ADS) is a Digital Library portal for researchers in Astronomy and Physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant. The ADS maintains three bibliographic databases containing more than 11.4 million records covering publications in Astronomy and Astrophysics, Physics, and the arXiv e-prints. For more information, please read our page detailing the Terms and Conditions. Regulating the use of our resources.