tokens: We dedicate this work to the memory of our dear colleague and co-author Dennis Lindle, who passed away during the writing of this paper. The authors thank J. Kaastra, T. R. Kallman, R. K. Smith, and E. M. Gullikson for stimulating conversations. W.C.S. and D.W.L. wish to acknowledge support by the National Science Foundation under NSF Grant No. PHY-09-70125. V.J. was funded by the European Social Fund under the Global Grant Measure (No. VP1-3.1-ŠMM-07-K-02-015). M.M.S. was supported by the CNPq-Brazil. D.W.S. was supported in part by the NASA Astrophysics Research and Analysis Program and the NASA Heliophysics Supporting Research Program. The experimental portion of this work was performed at the Advanced Light Source, which is supported by DOE (DE-AC03-76SF00098).
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