Energy levels, transition frequencies and Einstein A coefficients were taken from CDMS. Collisional rate coefficients are from Dumouchel et al (2010) who have also made calculations for HCN. The set of rate coefficients was scaled by a factor 1.37 to represent collisions with H₂.

• References
  Dumouchel, F., Faure, A., Lique, F. 2010, MNRAS 406, 2488