Figure 10

PCA analysis, score plots of 129 objects, 7 elements. Colour markers reflect object grouping by the age criterion (author G.G). a PC1 vs PC2 scores; b PC1 vs PC3 scores, Cu rich objects are grouped in the bottom left corner; c PC2 vs PC3 scores with Cu rich objects in bottom right. Using the same scale as in Figure 11 the constriction of the point cloud becomes evident.