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Self diffusion coefficients for the two tracers In114 and Sn113 in the liquid alloy indium-tin at the eutectic composition have been measured as a function of temperature in the range 200°C–450°C. The customary Arrhenius equation is used to describe the experimental results. For indium as a tracer we obtained D=(42.5±5.7) 10−5 exp(−2771±158RT)cm2/sec,and for tin D=(11.7±1.7) 10−5 exp(−1380±156RT)cm2/sec. It is possible that the large difference between the two activation energies could be associated with properties of the eutectic composition.