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Contour plots of coordinate density matrices (Q1) for the lowest excitation energy (S1 ← S0) in the cyclic and linear paraphenylenes. The x- and y-axis labels represent the number of benzene repeat units in the molecule. The elements of the coordinate matrix, Qmn, give a measure of exciton delocalization between sites m (x axis) and n (y axis). The color scale is given at the bottom.
