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(A–C) Loadings of the respective first principal component corresponding to the PCA maps shown in Figure 5. (A) loading of PC1 for map shown in Figure 5D,G (root); (B) loading of PC1 for map shown in Figure 5E,H (stem); and (C) loading of PC1 for map shown in Figure 5F,I (leaf); (D) Scores plot corresponding to the loading in (A) and the PCA maps in Figure 5D,G. The color bar indicates the scale chosen for the PCA map in Figure 5G, using the maximum value of 0.4 as reference position.
