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REFERENCES: "R. Laihoa and M. Lakkistoa. Investigation of the refractive indices of LaF<sub>3</sub>, CeF<sub>3</sub>, PrF<sub>3</sub> and NdF<sub>3</sub>, <a href=\"https://doi.org/10.1080/13642818308226470\"><i>Phil. Mag. B</i> <b>48</b>, 203-207 (1983)</a> (As cited in Handbook of Optics, 2nd edition, Vol. 2. McGraw-Hill 1994)."
COMMENTS: "Extraordinary ray (e)"
DATA:
  - type: formula 1
    range: 0.35 0.70
    coefficients: 0 1.5149 0.0878
