The lines have been reported by
(1) M. C. McCarthy, A. J. Apponi, C. A. Gottlieb, and P. Thaddeus, 2000, Astrophys. J. 538, 766.
Transition frequencies with uncertainties exceeding 0.1 MHz should be viewed with caution.
The ground state partition function is essentially converged at 300 K.
The dipole moment has been assumed.