The experimental measurements were taken from
(1) G. Klapper, L. Surin, F. Lewen, H. S. P. Müller, I. Pak, G. Winnewisser,
2003, Astrophys. J., 582, 262.
While the current predictions are expected to be sufficient for
most astronomical purposes, improved data will be presented
once an isotopic invariant fit has been performed.
The dipole moment and dipole centrifugal corrections are taken from
(2) D. Goorvitch,
1994, Astrophys. J. Suppl. 95, 535.
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