The lines have been reported by
(1) M. C. McCarthy, A. J. Apponi, C. A. Gottlieb, and P. Thaddeus, 2000, Astrophys. J. 538, 766.
With respect to the first entry of Nov. 2000, the reported uncertainties were too conservative. The entry was reevaluated with smaller ones.
Transition frequencies with uncertainties exceeding 0.1 MHz should be viewed with caution.
The dipole moment has been assumed.