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Cycle characterization. The spins assigned to clockwise, counterclockwise, and neutral links are 1, −1, and 0, respectively. The directional coherence of the cycle on the right is characterized by having absolute value of magnetization |M| = 3, 2 nodes with link–link correlation ρ = 1 (PT nodes), 2 nodes with ρ = −1 (source and sink nodes), and 2 nodes with ρ = 0 (those with impinging neutral links).
