Rotational energy levels, statistical weights, transition frequencies and Einstein A coefficients up to 680 cm^-1 above ground are from CDMS, version 2 of January 2017.

Collisional rates with H₂ are para-H₂ rates from Cabrera-González et al (2020), calculated for temperatures in the range from 5 to 300 K for energy levels up to J=18.