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The observed frequencies and the theoretical value
for the dipole moment were taken from
(1) P. Botschwina, Ä. Heyl, W. Chen, M. C. McCarthy,
J.-U. Grabow, M. J. Travers, and P. Thaddeus,
1998, J. Chem. Phys. 109, 3108.
The calculations should be accurate enough for all observations.
They should be viewed with caution if the calculated uncertainties
are larger than 0.1 MHz.
14N hyperfine splitting may matter
in astronomical observations. Therefore, a
separate hyperfine calculation is provided for
J' ≤ 10 below 12 GHz.
NOTE: The partition function
does take into account the spin multiplicity
of the 14N nucleus !
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