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Fig. 1. Fourier-transform infrared spectroscopy (FT-IR) spectrum of ambient air between 600 and 4000 cm^–¹ (reverse scale increases with wavelength; measured with 20 m long path gas cell). The IR lines of the strong absorbers CO₂ and H₂O stand out. Sections with absorption lines of environmentally relevant trace gases are marked by circled numbers: 1: CO; 2: NH₃; 3: N₂O; 4: CH₄.