Energy levels, transition frequencies and Einstein A coefficients were taken from CDMS. The collisional rates are taken from Turner et al. (1992) and were calculated for temperatures in the range from 20 to 300 K including energy levels up to J=20 for collisions with H₂. The datafiles available here include extrapolation to include energy levels up to J=40 and collisional temperatures up to 2000 K. For details on the extrapolation see Schöier et al. (2005).

• References
  Turner, B.E., Chan, K, Green, S., Lubowich, D.A. 1992, ApJ, 399, 114
  Schöier, F.L, van der Tak, F.F.S., van Dishoeck, E.F., Black, J.H. 2005, A&A 432, 369