???W, Tungsten
Tungsten, also known as wolfram.
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Refractive Index Reference - J. H. Weaver, C. G. Olson, and D. W. Lynch, Phys. Rev. B 12, 1293 (1975) and B. L. Henke, P. Lee, T. J. Tanaka, R. L. Shimabukuro, and B. K. Fujikawa, At. Data Nucl. Data Tables 27, 1 (1982)
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