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Relationships between dynamics and structure. (a) Initial state of system. Gray nodes are primed; white quiescent. (b) If the node in upper left corner (black, with gray border) fires, it generates an avalanche (black nodes) by spreading along edges. (c) The subnetwork attained by removing the quiescent nodes from the network in (a). An avalanche beginning at a given node in the subnetwork will propagate and encompasses the entire connected component containing that node.
