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Appendix S1. Proton-transfer-reaction instruments in atmospheric sciences.

Figure S1. Transmission curve of the applied PTR-TOF instrument in comparison to the expected transmission curve of a reference instrument (source: Ionicon).

Figure S2. Enlarged display of selected signals in Figure 7 for the PTR-QMS (red bar) and PTR-TOF (black line).

Table S1. Fitting parameters for a non-linear regression of the triethylamine -concentrations from Figure 3 using equation (S1).

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