The lines were reported by
(1) P. B. Changala, N. Genossar-Dan, E. Brudner, T. Gur,
J. H. Baraban, and M. C. McCarthy,
2023, Proc. Natl. Acad. Sci. USA 120, Art. No. e2303586120.
Several parameters were evaluated from the main isotopolog.
The calculation may be sufficiently accurate up to 50 GHz;
some caution may be advisable at higher frequencies.
The dipole moment of the main isotopolog was taken from
a quantum-chemical calculation by
(2) D. E. Woon, 1996, Astrophys. J. 456, 602.
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