Data originally published at 10.1111/j.1151-2916.1964.tb13128.x. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Metallic Elements and Alloys*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 7, IFI/Plenum, New York, 1970; table 233, curve 24. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).