Comparison of the mean (left column) and normalised standard deviation (right column) obtained for the ratios and dealing with p–H₂. The approximation consists in neglecting the terms with Δj₂ ≥ 2 in the calculation of the thermalised CRC. The results obtained with this approximation are compared to the quantum state-to-state CRC (black lines) from Dubernet et al. (2009) and Daniel et al. (2011), the QCT CRC (red lines) from Faure et al. (2007) and thermalised CRC (blue lines) from Dubernet et al. (2009) and Daniel et al. (2011).