The data was summarized by
(1) P. Drean, J. Demaison, L. Poteau, and J.-M. Denis,
J. Mol. Spectrosc. 176 (1996) 139.
Further lines are from
(2) L. Bizzocchi, S. Thorwirth, H. S. P. Mueller,
F. Lewen, and G. Winnewisser,
J. Mol. Spectrosc. 205 (2001) 110.

NOTE: Corrections have been applied to account FULLY
for the expansion in (J(J+1) - l^2) instead of J(J+1) !