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Häni, Christoph; Bühler, Marcel; Neftel, Albrecht; Ammann, Christof; Kupper, Thomas (2021). Performance of open-path GasFinder3 devices for CH4 concentration measurements close to ambient levels. Atmospheric Measurement Techniques, 14(2), pp. 1733-1741. Copernicus Publications 10.5194/amt-14-1733-2021