Profile decomposition of the ¹²CO₂ 2.70 µm combination mode using selected laboratory spectra based on the analysis performed in Brunken et al. (2024). In the left and middle panel, the black line shows the observed spectrum, and the blue line shows the linear combination of all the five different components at low temperature. The yellow line corresponds to the CO₂:CH₃OH (10 K) component. The pink line shows the contribution of the broad CO₂:H₂O (10 K) component. The purple line corresponds to the diluted CO₂:CO (25 K) component, and the orange line shows the contribution of CO₂ and CO mixed in an equal ratio (15 K). Finally, the dark red line corresponds to the pure CO₂ (80 K) component. In the right panel, the black line shows the observed spectrum, and the blue line shows the linear combination of all the three different components at high temperatures. The green line corresponds to the hot CO₂:CH₃OH (105 K) component. The gray line shows the contribution of the hot CO₂:H₂O (160 K) component. Finally, the dark red line corresponds to the pure CO₂ (80 K) component. All laboratory spectra are taken from Ehrenfreund et al. (1997, 1999); van Broekhuizen et al. (2006) and are publicly available in the Leiden Ice Database (LIDA) (Rocha et al. 2022). Further details of the laboratory spectra can be found in Brunken et al. (2024).