= Strong Lines of Carbon by National Institute of Standards and Technology
{c}
{tag=Work by National Institute of Standards and Technology}
https://physics.nist.gov/PhysRefData/Handbook/Tables/carbontable2.htm
The institutional <carbon> <spectral line> table explicitly separates vacuum and air <wavelengths>. Its $193.0906\,\mathrm{nm}$ C I line is a vacuum <wavelength>, while its $247.8561\,\mathrm{nm}$ C I line is an air <wavelength>. Their differing conventions matter when converting line positions into atomic <energy> differences.
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