The lines were taken from
(1) B. A. McGuire, M.-A. Martin-Drumel, S. Thorwirth, S. Brünken, V. Lattanzi, J. L. Neill, S. Spezzano, Z. Yu, D. P. Zaleski, A. J. Remijan, B. H. Pate, and M. C. McCarthy, 2016, Phys. Chem. Chem. Phys. 18, 22693.
Higher order spectroscopic parameters were estimated from the main isotopolog. Predictions have been limited to K_a = 0. Nevertheless, they should be viewed with great caution.
The partition function takes into account higher K_a levels. The ab initio dipole moment was taken from
(2) D. E. Woon and E. Herbst, 2009, Astrophys. J. Suppl. Ser. 185, 273.
The molecule has also a moderately large b-dipole moment component. However, predictions would be completely unreliable at present and have thus been omitted.