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This work was conducted under U.S. Air Force Space and Missile Systems Organizatisn (SAMSO) Contract No. F 04701-70-0059.
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Walker, A.B.C. The coronal X-spectrum: Problems and prospects. Space Sci Rev 13, 672–730 (1972). https://doi.org/10.1007/BF00213505
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DOI: https://doi.org/10.1007/BF00213505