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Figure 3
Multiplied images of element groups determined by principal component analysis, for the twisted internode (a and c) and for the straight internode (b and d). Micronutrient element (Mn, Zn, Cu, Fe) grouping is shown in (a) and (b), while the multiplied images for macronutrient elements (K, Ca, Cl, P) is presented in (c) and (d). Brighter colours on the scale bars indicate a distinct correlation while dark colours refer to a less pronounced grouping.

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