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Very accurate microwave data were obtained in the laboratory
and through observarions in the course of an observational
study by
(1) C. Cabezas, M. Agúndez, C. Pérez, D. Villar-Castro,
G. Molpeceres, D. Pérez, A. L. Steber, R. Fuentetaja,
B. Tercero, N. Marcelino, A. Lesarri, P. de Vicente, and J. Cernicharo,
2025, Astron. Astrophys. 701, Art. No. L8.
The calculation was truncated at J = 60 and at 180 GHz.
Transition frequencies with uncertainties around 0.1 MHz or more
should be viewed with caution.
The dipole moment was evaluated in a quantum chemical study in (2).
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