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Determine whether a single local quantity predicts the breakdown-limited gradient across structure geometries, frequencies $1\\text{-}30\\,\\mathrm{GHz}$ and DC spark systems to within 20 percent at fixed breakdown rate and pulse length, or whether the limit is irreducibly geometry dependent.","problem_ref":null,"references":"","settled_by":"A blind comparison of predicted and measured limits for a set of structures differing in geometry and frequency.","status_note":"","title":"Which local field quantity determines the breakdown-limited 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