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tokens: This research was supported via award numbers GO1–12025A and GO3–14019A to Rochester Institute of Technology and GO3–14019B to Vanderbilt University issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-03060 (RIT). R.S.'s contribution to the research described here was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA, and supported via an award issued by the Chandra X-Ray Observatory Center. This research has made use of data obtained from the Chandra Data Archive and the Chandra Source Catalog, and software provided by the Chandra X-ray Center (CXC) in the application packages CIAO. This research has made use of data and/or software provided by the High Energy Astrophysics Science Archive Research Center (HEASARC), which is a service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory. E.B. acknowledges support from an IBM-Einstein Fellowship at IAS, and a Simons Foundation Fellowship. J.A.T. and M.A.G. are supported by the Spanish MICINN grant AYA 2011-29754-C03-02 co-funded with FEDER funds.