Context

Context of "Monitoring MRK 509 : the origin of the reprocessor" and "Broad band X-ray spectrum of narrow line Seyfert 1 AKN 564", submitted by the Trustees of Columbia University in the City of New York ; prepared by Columbia Astrophysics Laboratory, Departments of Astronomy and Physics, Columbia University ; principal investigators, Jules P. Halpern & Karen M. Leighly, (microform)
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