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Fig. 3

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(black) Positive ion spectra of the three regular experiments normalized to the peak at m/z 29, and compared to the same experiments lead with isotopic gases: (red) 13CH4, and (green) with 15N15N. The upper panel corresponds to the mass range 27–32 u (C2 block), whereas the lower panel corresponds to the mass range 41–46 u (C3 block).

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