Rate coefficients for the rotational excitations j = 0 → 1, j = 0 → 2, and j = 1 → 2 of CO due to collisions with H₂ at a kinetic temperature of 10 K. Filled circles show the theoretical rate coefficients for CO collisions with para-H₂ as a function of years. Open circles indicate experimental rate coefficients for CO collisions with normal-H₂ (Labiad et al. 2022, L22). Experimental error bars correspond to 2σ statistical errors (see text for details). Theoretical references are Green & Thaddeus (1976) (GT76), Schinke et al. (1985) (S85), Flower & Launay (1985) (FL85), Flower (2001) (F01), Mengel et al. (2001) (MDH01), Wernli et al. (2006) (W06), Yang et al. (2010) (Y10), Chefdeville et al. (2015) (C15), and Dagdigian (2022c) (D22).