The data was taken from "Rotational Spectra of the Thiosulfeno Radical,
HSS and DSS, between 0.3 and 0.9 THz" by M. Tanimoto, T. Klaus, H. S. P.
Mller, and G. Winnewisser, J. Mol. Spectrosc. 199 (2000) 73 - 80; and
references therein.

Fits are presented in the S reduction using A-(B+C)/2, (B+C)/2, (B-C)/4
or A, B, C and with the A reduction using A, B, C.