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  "title": "Two-color measurements supporting a revised formulation for the refractive index of air",
  "contactPoint": {
    "fn": "Patrick Egan",
    "hasEmail": "mailto:patrick.egan@nist.gov"
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  "modified": "2026-04-13",
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    "Data and analysis supporting the article \"Two-color measurements supporting a revised formulation for the refractive index of air,\" by PF Egan in Measurement Science and Technology (2026).",
    "The measured data are in the files \"data-GASNAME-2color.csv\" where GASNAME is",
    "*  carbon dioxide",
    "*  oxygen",
    "*  bMixN787",
    "*  bMixN200",
    "*  dry air with a CO2 mole fraction of 388.86 ppm",
    "*  water",
    "The bMixN787 and bMixN200 refer to binary mixtures of nitrogen + oxygen, where the mole fraction of nitrogen was 0.78706 and 0.19971, respectively.",
    "Additionally, the water measurements performed at the six alternate C-band wavelengths are titled \"data-water-2color-15XX.csv\" where the 15XX denotes the nominal wavelength.  The header information in those datafiles gives the exact frequency of the nominal C-band wavelength.",
    "The analysis scripts called \"plotGASNAME.py\" reproduce the Figures 1, 2, 3, 4, 5, 6, and 7 from the article.  The analysis scripts also output the Tables 1, 2, 3, and 4 in numerical format to the terminal prompt.",
    "Some analyses either use literature data for a reference property, or compare present results with literature data.  These literature data are included in the directory \"lit\".  The scripts detailed above automatically load literature data as needed."
  ],
  "keyword": [
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    "Ciddor equation",
    "Edlen equation",
    "reference formulation",
    "two-color interferometry"
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  "authors": [
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      "familyName": "Egan",
      "fn": "Patrick  Egan",
      "givenName": "Patrick",
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  "annotated": "2026-04-16T18:25:21.665840",
  "revised": "2026-04-16T18:25:21.665840",
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