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Fig. 2

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Normalized QMS ion counts for m/z = 19 (DHO), 15 (NH), and 29 (13CO) as functions of the temperature at the deposition pressure of Pd = 6 × 10−7 Torr. The three species are representative of H2O, NH3, and CO, respectively. The blue line represents the best fit using the relation Q = 1 - D. Red dots are the derivative of the column density expressed in monolayers (right vertical axes).

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