The lines have been summarized in
(1) M. C. McCarthy, M. J. Travers, A. Kovács, C. A. Gottlieb, and P. Thaddeus, 1997, Astrophys. J. 113, 105.
The fit has been carried out using constants and quantum numbers of Hund's case (b). The dipole moment is from an ab initio calculation by
(2) D. E. Woon, 1995, Chem. Phys. Lett. 244, 45.