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Brightman, M. ,  Treister, Ezequiel. ,  Silverman, J. D. ,  Mainieri, V. ,  Ueda, Y. ,  Schramm, M. ,  Matsuoka, K. ,  Nagao, T. ,  Steinhardt C. L. ,  Kartaltepe, J. ,  [A statistical relation between the X-ray spectral index and Eddington ratio of active galactic nuclei in deep surveys.] ,  A statistical relation between the X-ray spectral index and Eddington ratio of active galactic nuclei in deep surveys.