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. 2019 Oct 9;14(10):e0222484. doi: 10.1371/journal.pone.0222484

Fig 8.

Fig 8

Total ion GCXGC chromatographs of a peptone buffer control (top) and a Listeria VOC sample (bottom) showed different VOC features present in VOC sample compared to the buffer. Peaks can be located with two retention times as x and y axis and peak intensity is in z axis.