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a,b) – Problem geometry with the observation planes. The insulating lead is 18 mm long. Four ring electrodes are driven with –1 V each. c,d) – Comparison with a lower-resolution FEM solution; e,f) – the same results for a finer FEM solution with a larger enclosing box. BEM-FMM solution is red; FEM solution is blue. g,h) – dE/dl for the x-directed fiber in two observation planes – BEM-FMM solution.
