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The experimental transition frequencies are from
astronomical observations by
(1) C. Cabezas, R. Fuentetaja, E. Roueff, M. Agúndez, B. Tercero,
N. Marcelino, J. R. Pardo, P. de Vicente, and J. Cernicharo,
2022, Astron. Astrophys. 657, L5.
The rotational parameter A was taken from
a quantum chemical calculation in (1).
Some spectroscopic parameters (DK,
HKJ, and HJK) were estimated
from the main species and from CH2DCCH.
Transition frequencies with calculated uncertainties
exceeding 0.1 MHz should be viewed with great caution.
Transition frequencies with K > 1 should be viewed
with caution throughout.
The a-dipole moment component was assumed to agree
with the dipole moment of the main species, see e064507.cat.
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