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The lines have been reported by
(1) M. C. McCarthy, M. J. Travers, A. Kovács, C. A. Gottlieb,
and P. Thaddeus, 1996, Astron. Astrophys. 309, L31;
and by
(2) M. C. McCarthy, W. Chen,
A. J. Apponi, C. A. Gottlieb, and P. Thaddeus,
Astrophys. J. 520, 158.
The fit has been carried out using constants and quantum numbers of Hund's case (b).
The dipole moment has been estimated.
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