The spectrum is due to krypton. A green line at 557 nm and
a yellow line at 587 nm are listed as known wavelengths for krypton.
Note that more wavelengths may be seen than are listed. Lists
of known wavelengths often include only the most distinctive and
easily identifiable wavelengths of a gas. Refer to the CRC Handbook
of Chemistry and Physics for sets of known wavelengths for gases.
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