A global router determines edge capacity of global tiles for a first integrated circuit in a global routing operation. The global router determines a respective edge capacity of first width wire tracks for each of a plurality of global tiles in a first metal layer in the first integrated circuit in a first global routing operation. The global router determines a respective edge capacity of second width wire tracks for each of the plurality of global tiles in the first metal layer in the first integrated circuit in a second global routing operation. The edge capacities for first width and second width wire tracks are determined in separate operations by the global router as part of the operations performed for fabrication of the first integrated circuit.
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