The data have been published in
S. Bruenken et al.: 
Sub-Doppler and Doppler Spectroscopy of DCN Isotopomers in the 
Terahertz Region: Ground and First Excited Bending States;
J. Mol. Spectrosc. 223 (2004) 132 - 137.

This is a very nice example for fitting sub-Doppler resolved
data, including the so-called crossovers, and 
Doppler-limited pure rotational data, including direct-l-type
transitions, together with infrared data.

More information will be given in the not too distant future.