Bar charts showing the distribution of spines by cluster according to maximum probability <i>p</i>*.

<p><b>(A)</b> Distribution of spines into the six clusters. <b>(B)</b> Relative frequency distribution of clusters for apical (left) and basal (right) spines. <b>(C)</b> Relative frequency distribution of clusters for C40 (left) and C85 (right) spines. <b>(D)</b> Relative frequency distribution of clusters for the combination of dendritic compartment and age, apical C40 (left end), apical C85 (center left), basal C40 (center right) and basal C85 (right end). Horizontal lines in (B), (C) and (D) denote the heights shown in (A). <b>(E)</b> Bar chart showing the distribution of spines belonging to each of the six clusters according to distance from soma. Horizontal lines denote the percentage of spines in each cluster (A). Spines were grouped into intervals of 50 μm to improve visualization.