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. 2020 Nov 21;413(4):1009–1016. doi: 10.1007/s00216-020-03059-9

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© The Author(s) 2020

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Fig. 6 — Ion mobility spectra of 50 ppb_v 2-butanone (green, dashed dotted line), 50 ppb_v 2-heptanone (red, dotted line), and a mixture of 50 ppb_v 2-butanone and 50 ppb_v 2-heptanone (blue, continuous line) in purified, dry air. Operating parameters are given in Table 1. IMS pressure p = 1020 hPa