Energy levels, transition frequencies and Einstein A coefficients for the CH spin-rotation spectrum without hyperfine structure are based on CDMS, version 3 of June 2015. Collision rates are taken from Marinakis et al (2015) and were calculated for temperatures in the range from 10 to 300 K including energy levels up to 1000 cm^-1 above the ground state. The rates were scaled from He to H₂, but not extrapolated.

Hyperfine-resolved collision data for the CH-H₂ and CH-H systems were calculated by Dagdigian (2018). These data cover temperatures from 10 to 300 K, and 32 states up to 275 cm^-1 above the ground. In the case of CH-H₂, collisions with ortho and para H₂ are distinguished.