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Fig. 3


Close-up of the CO desorption peak (shaded blue) for the 1:5 13CH3OH:CO mixed ice. mz 16 (black) traces CO, while mz 30 (dark grey) and 31 (light grey) trace C18O and 13 C18O, respectively. The signal in mz 32 (green) is caused by minor traces of 16O2. mz 33 (red) is associated with 13CH3OH. We note the logarithmic scale.

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