Comparison of calculated spectra for 1 bar of pure CO₂ gas at 750 K, with (black line) and without (red line) the χ factors. The blue line is the spectrum calculated for the same pressure and temperature conditions, but using HITEMP 2024 (Hargreaves et al. 2024) instead of HITRAN 2020 (Gordon et al. 2021). The vertical dotted black lines illustrate the definition interval of the three main bands of CO₂ we consider. The horizontal dashed, dot-dashed, and dotted gray lines represent the intervals for which measurement of the continuum (excluding CIAs) are available for CO₂-CO₂, CO₂-N₂, and CO₂-H₂O, respectively.