Figure 4.

(a) Distance matrix: each square element of this matrix represents the distance (1 minus Spearman correlation) between pairs of spaces. (b) MDS representation of the distance matrix depicted in (a): each point represents a particular space, and the distance between two points represents the degree of similarity between the spaces (the smaller the distance, the greater the similarity). [Color figure can be viewed in the online issue, which is available at http://wileyonlinelibrary.com.]