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Experimental-migration front speed as a function of concentration in the range 0.15–0.35%, together with a best fit to the data using our model. Also shown for best-fit parameters are the model efficient and confused limits, and the prediction from gas kinetic models (23). (Inset) The same data, but including points for C = 0.4–0.5%, labeled differently to indicate a different mode of migration at these concentrations. The model breakdown in this region is evident.
