The 1 – 0 transition was taken from
(1) M. Winnewisser , B. P. Winnewisser , and G. Winnewisser 1985, Mol. Astrophys. ser. C, 157, 375.
Additional lines measured with microwave accuracy (J" = 1 – 7 and 15 – 17) were taken from
(2) G. Klapper, F. Lewen, R. Gendriesch, S. P. Belov, and G. Winnewisser 2001, Z. Naturforsch., 56a, 329.
The dipole moment and dipole centrifugal corrections were taken from
(2) D. Goorvitch 1994, Astrophys. J. Suppl. 95, 535.