Fig. 3.

Graphical description of the main fifteen neighborhood matrices (of size $14\times 14$) considered for the comparative analysis a. The entries of the matrices ($w_{\mathit{ij}}$) have been row-normalized to allow for comparison ($w_{\mathit{ij}}$ always lies between 0 and 1). The correlation between each pair of matrices, computed as the correlation between the vectorizations of the matrices, are shown in b