Decomposition of the ¹³CO₂ bands using selected laboratory spectra. The black line shows the observed spectrum, and the blue line shows the linear combination of all five different components. The dark green line corresponds to the CO₂:CH₃OH component. The aquamarine line shows the contribution of the broad CO₂:H₂O component. The gold line corresponds to the diluted CO₂:CO component, while the orange line shows the contribution of CO₂ and CO mixed in equal parts. Finally, the dark red line corresponds to the pure CO₂ component. The shaded area shows the 3σ rms in optical depth scale. The results for HOPS 370 are shown in a separate analysis.