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Fig. 1

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Thermal desorption of a mixed H2O:CO2:CO ice film at 100:15:5 ratio recorded during a Temperature Programmed Desorption (TPD) experiment, where the release of each molecule is measured with a mass spectrometer. Carbon monoxide was traced with the 13CO isotope. Four distinct release events are visible: pure-phase CO (1), pure-phase CO2 with CO co-desorbing (2), volcano desorption of CO and CO2 (3), and water desorption with co-desorption of CO and CO2 (4). Desorption and trapping fractions of volatiles can be determined by integrating the TPD trace over discrete temperature ranges. The data are adapted from Kipfer et al. (2024a).

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