Data from: H.J. Hageman, W. Gudat, and C. Kunz. H. J. Hagemann, W. Gudat, and C. Kunz, J. Opt. Soc. Am. 65, 742 (1975); H.J. Hageman, W. Gudat, and C. Kunz, Optical Constants From the Far Infared to the X-ray Region: Mg, Al, Cu, Ag, Au, Bi, C, and Al₂O₃. DESY Report SR-74/7 (1974).