Energy levels, transition frequencies and Einstein A coefficients were taken from Chandra & Rashmi (1998). The collisional rates are taken from Chandra & Kegel (2000) and were calculated for temperatures in the range from 25 to 125 K including energy levels up to 50 cm^-1 for collisions with H₂. At present no extrapolated rates are provided.

• References
  Chandra,S., Kegel, W.H. 2000, A&AS, 142, 113
  Chandra & Rashmi 1998, A&AS 131, 137