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The experimental data were taken from
(1) Y. Kasai, K. Obi, Y. Ohshima, Y. Hirahara, Y. Endo,
K. Kawaguchi, and A. Murakami,
1993, Astrophys. J. 410, L45;
and from
(2) V. D. Gordon, M. C. McCarthy, A. J. Apponi, and P. Thaddeus,
2001, Astrophys. J. Suppl. Ser. 134, 311.
The data in (2) are a subset of those in (1); the agreement is
very good.
Predictions beyond about 90 GHz should be viewed with caution.
The dipole moment is an estimate based on
(3) P. Botschwina,
2003, Phys. Chem. Chem. Phys. 5, 3337.
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