Comparison of the mean (m) and normalised standard deviations (σ/m, given by Eq. (4)) for the ratios (left column) and (right column). The intensities are defined by Eq. (1). The statistical analysis is performed on the lines that involve the first N_max = 20 o–H₂O energy levels. The comparison deals with p–H₂ CRC. The quantum CRC with p–H₂ are from Dubernet et al. (2009) and Daniel et al. (2011), the quantum CRC with He from Green et al. (1993) and the QCT CRC are from Faure et al. (2007). In the case of the quantum CRC, the rates considered are the STS CRC with H₂ in j₂ = 0. The comparison is performed at the water abundances χ(H₂O) = 10^-8, 10^-6, and 10^-4 (rows).