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