Figure 2: Dendrogram for hierarchical agglomerate clustering of patients. y-axis=cases (Each row on the y-axis represent 1 patient, because of the limited resolution of the dendrogram, cases were not labeled); x-axis=distance linkage (dlink) between patients’ clusters standardized against the maximal distance (dmax). Highly correlated clusters are nearer to the left side of the dendrogram, less correlated clusters are more distant from the left axis. As far as they move right the dendrogram, clusters get bigger: each vertical line represent a merge, the x-coordinate of the vertical line is the similarity of clusters that were merged. By moving up from the left layer to the right node, the dendrogram allow to reconstruct the history of merges that resulted in the depicted clustering