Adjustment of the χ factors of CO₂ broadened by N₂ for various temperatures. The black dashed and dot-dashed lines correspond to experimental data from Niro et al. (2004) and Burch et al. (1969), respectively. The black dotted line corresponds to a spectrum computed using the ECS model from Niro et al. (2004), which is the core of the ν₂ band without local bands. The red dotted line is our χ factor calculation of the ν₂ band without local bands. For visualization reasons, we arbitrarily multiplied the spectra by a factor (see offset on the figure) to avoid a potential overlap of the curves.