Fig. 4

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Characterization of selected features in the H2O:NH3:H2S 4:3:2 spectra in the period between the end of the ice deposition and the start of the ice warm-up. During this time, the sample was held at 15 K. Top: peak area of the NH4+ ν4 feature. Middle: peak area of the blended NH3 umbrella bending and H2S bending features. Bottom: peak position of the NH4+ ν4 feature.
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