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after much discussion about the implementation. Since it is not exactly clear what the field lines do at corners, the implementation depends largely on an unknown and presumably global constant multiplier; this has provisionally been set to 1 but needs to be determined empirically with a field equation solver. At least one rational approximation suggests a value of pi/2 instead of 1. The corner capacitance can be considered a refinement of existing parasitic capacitance extraction, and since it takes a non-trivial additional amount of computation, it is left as an option to "extract" that can be turned on when a more accurate result is preferred at the expense of a longer extraction time. |
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