Figure 3

PCA score plot based on the 1D 1H 600 MHz NMR spectra of (a) all 34 green tea samples: unburied, tea buried in grassland, woodland, RMI and RMII, (b) only buried tea samples. The legend indicates the colour coding for each sample site. The Hotelling’s T2 ellipse represents the 95% confidence interval. Outlying RMI or RMII samples are marked by a single or double asterisks, respectively.