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 blue dashed line is the CO₂-CO₂ continuum obtained by applying the ν₃ χ factor on the entire spectrum, while the solid blue line is the actual CO₂-CO₂ continuum. The red and gray lines are the CO₂ and H₂O line centers, respectively. The green and orange lines are the CO₂-N₂ and CO₂-H₂O continua, respectively.