{
  "plate": "OP966",
  "source": "https://physics.nist.gov/PhysRefData/Handbook/Tables/hydrogentable2_a.htm",
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      "scope": "Relative, internally tested wavelength assignment; no absolute observer-frame wavelength or radial velocity calibration"
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  ],
  "redshift": "Unconstrained: changing the stellar Doppler scale can be absorbed exactly into the fitted dispersion coefficient. A comparison lamp, suitable telluric reference or independent instrument scale is needed for observer-frame wavelength and radial velocity.",
  "cautions": [
    "Three unused lines check a two-anchor inverse-square dispersion model; final delivered scale refits all five lines",
    "Checked reference span 3835.384–4340.462 Angstrom; gray regions are extrapolation",
    "Gaussian widths include instrument profile, photographic response, sampling and stellar broadening",
    "Blends and the photographic characteristic curve prevent abundance or physical flux inference",
    "Successful candidate identification is not a spectrograph identity or an absolute velocity calibration"
  ]
}