Absorption spectrum for a gas mixture including 0.01 bar of H₂O, 1 bar of CO₂, and 1 bar of N₂ at 300 K. The red and gray lines are the spectra containing the centers of absorption lines (of CO₂ and H₂O, respectively) up to ±25 cm⁻¹. The other solid lines are the CO₂ continua obtained using the original χ factors from this work, while the dashed lines are the spectra calculated with previously existing factors. The continua calculated with existing χ factors (dashed lines) are based on Tran et al. (2011), Perrin & Hartmann (1989), and Tran et al. (2018) for pure CO₂, CO₂-N₂, and CO₂-H₂O, respectively. For this comparison, we did not use χ factors from Burch et al. (1969) to calculate the ν₁ + ν₃ band of CO₂-N₂ as it is based on a different formalism, and thus the factors derived for the ν₃ band (Perrin & Hartmann 1989) are applied everywhere (green dashed line).