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Fig. 1 | BMC Plant Biology

Fig. 1

From: Regional differences in clonal Japanese knotweed revealed by chemometrics-linked attenuated total reflection Fourier-transform infrared spectroscopy

Fig. 1

(a) Class means raw and (b) class means pre-processed (SG smoothed and vector normalised) IR spectra in the fingerprint region (1800–900 cm− 1) grouped by the different regions where knotweed samples were collected (NEE: North East England, NWE: North West England, WS: West Scotland); (c) class means raw and (d) class means pre-processed (SG smoothed and vector normalised) spectra in the fingerprint region (1800–900 cm− 1) grouped by the different sites where knotweed samples were collected (Scotland: SRC, SOM, SLM, SAP; North West England: ESA, ESB; North East England: EDB)

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