Energy levels, transition frequencies and Einstein A coefficients were taken from JPL. The collisional rates are taken from Green & Chapman (1978) and were calculated for temperatures in the range from 10 to 100 K including energy levels up to J=12 for collisions with H₂. Extrapolation to include energy levels up to J=99 for temperatures between 10 and 500 K has been made. For details on the extrapolation see Schöier et al. (2005).

• References
  Green, S., Chapman, S. 1978, ApJSS, 37, 169
  Schöier, F.L, van der Tak, F.F.S., van Dishoeck, E.F., Black, J.H. 2005, A&A 432, 369