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Dual connection spines have similar head volumes. The empirical cumulative distribution function of the difference between two spines (a-c) and the ratio between two spines (d-f) belong to the dual connection (red), compared to two random spines from the entire database (blue). Kolmogorov–Smirnov test p-values: (a) p = .5448, (b) p = .7437, (c) p = .0711, (d) p = .0038, (e) p = .5967, and (f) p = .0602. The dataset includes 41 dual connection pairs
