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Schematic of the topological constraints applied when adding new edges to the surrogate network. The black lines represent the known SA2 → SA2 and SA2 → DZN connections given by the networks B and Γ. The green lines are the allowed surrogate SA1 → DZN edges, as they are consistent with the known larger-scale topology. The red lines represent edges that are not allowed, as their inclusion would violate our constraints after aggregation of the surrogate to larger partition schemes.
