### Vis-NIR absorption coefficients spectra of liq-CH4, CH4-I and CH4-II from 93 to 20 K

Will Grundy & Bernard Schmitt
Vis-NIR absorption coefficients spectra of $CH_4$ at 93 K (liquid), from 90 K to 20 K, every 10 K (CH4-I), and at 20K (CH4-II)
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