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Clusters of voxels at which the TDED exceeds 6σ, obtained by applying k-means clustering and the Pearson squared similarity measure to experimental data for PYP spanning the microsecond to second time range. Each panel represents a different cluster. The number of voxels in each cluster is shown in parentheses: A(30), B(57), C(20), D(15), E(81), F(38), G(7), H(54).
