Adjustment of the χ factors of a pure CO₂ gas for various temperatures. We include the CIA, near 7050 cm⁻¹, from Filippov et al. (1997) (black dotted line, right panel) to adjust the χ factors at 295 K. The black dashed, solid, and dot-dashed lines correspond to experimental data from Tran et al. (2011), Tran et al. (2024), and Burch et al. (1969), respectively. The colored lines are the spectra calculated with our model, using the original χ factors proposed in this work. For visualization reasons, we arbitrarily multiplied the spectra by an offset (see offset in the figure) to avoid a potential overlap of the curves.