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Figure 6: Colourmap and associated clustergram for CISED extract data for a selection of the test soils. The dendrogram along the left-hand side shows how individual components link together. The horizontal line divides the colourmap into clusters and the vertical line separates the element compositions data on the left-hand side from the extraction number data on the right. A high proportion of each component and an indication of its composition are shown by a white or pale grey colouration with a low proportion as dark grey or black.