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The experimental transition frequencies are from
(1) G. A. Heath, L. F. Thomas, E. I. Sherrard, and J. Sheridan,
1955, Discuss. Faraday Soc. 19, 38;
and from astronomical observations by
(2) C. Cabezas, R. Fuentetaja, E. Roueff, M. Agúndez, B. Tercero,
N. Marcelino, J. R. Pardo, P. de Vicente, and J. Cernicharo,
2022, Astron. Astrophys. 657, L5.
B and DJK were fit, several other
spectroscopic parameters were estimated from the main species.
Transition frequencies with calculated uncertainties
exceeding 0.1 MHz should be viewed with great caution.
Transition frequencies above 100 GHz should be viewed
with caution.
The dipole moment was assumed to agree with that
of the main species, see e064507.cat.
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