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 may be reasonable up to about 100 GHz. Predictions of transitions with K_a = 2 should be viewed with great caution.
¹⁴N and possibly D hyperfine splitting may be resolved for low values of J. Therefore, a separate hyperfine calculation is provided for J' ≤ 4 and K_a ≤ 1 along with appropriate partition function values.
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.