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R normalized to Rn = 260 Ω vs. H at temperatures 3.6, 3.62, 6.64, 3.68, 3.72, and 3.76 K. The dotted line is a fit to Equation (2) for T = 3.6 K. Inset: Calculated magnetoresistance based on Equation (2) for t = T/Tc = 0.92 to 0.98.