The observed lines are from
(1) L. F. Thomas, E. I. Sherrard, and J. Sheridan, 1955, Trans.Faraday Soc. 51, 619;
(2) V. Meyer, Diploma Thesis, Kiel, 1990, kindly provided by H. Mäder; and from
(3) M. Le Guennec, J. Demaison, G. Wlodarczak, and C. J. Marsden, 1993, J. Mol. Spectrosc. 160, 471. The D_K value has been estimated in (3). The dipole moment was taken from the main isotopomer, see e040502.cat. The rotation of the inertial axis system with respect to that of the main isotopomer causes a negligible reduction of the a component and a b component of probably less than 0.05 D. Since no b type transitions have been observed, the respective transitions have been omitted from the predictions because of the large uncertainties of their positions.
Note: Non-trivial spin-statistics do not matter for this low symmetry (C_S) isotopolog.
The dipole moment was assumed to be the same as for the main isotopomer, see e040501.cat.