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REFERENCES: "D. F. Edwards and R. H. White, \"Beryllium Oxide,\" in E. D. Palik (ed.), Handbook of Optical Constants of Solids II, Academic Press, Orlando, 1991, pp. 805-814."
COMMENTS: "Extraordinary ray (e). Room temperature"
DATA:
  - type: formula 1
    range: 0.44 7.0
    coefficients: 0 1.96939 0.08590 1.67389 10.4797
