The rotational data were reported by
(1) S. Carles, H. Møllendal, and J.-C. Guillemin, 2013, Astron. Astrophys. 558, Art. No. A6.
Several lines have fairly large residuals, but no adjustment was done. The calculated spectrum should be suitable for searches in luke warm sources, possibly even in warm sources. The calculation was truncated at 200 GHz and at J = 77. Transition frequencies with calculated uncertainties exceeding 0.1 MHz should be viewed with caution.
The dipole moment components are from (1), but b-type transitions are currently too uncertain.