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a Contours of the constant magnetic field plotted at 1, 5, 10 ppm intervals (ideal Lee-Whiting system with 3 significant digits for wires distribution). b Contours of the constant magnetic field plotted at 1, 5, 10 ppm intervals [(NI)2/(NI)1 = 9/4 contracting system with 3 significant digits for wires distribution]
