tokens: We are grateful to Scott Adams and Kevin Croxall for helpful discussions about the analysis of MODS prism data. We also appreciate helpful comments from the referee. Support for this work was provided by the National Aeronautics and Space Administration through Chandra Award No. G04-15134X issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8-03060. The work of P.M. is partially supported by the National Science Foundation under grant 1615553 and by the Department of Energy under grant DE-SC0015525.
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