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Ratio of torque in H2O medium to that in D2O medium for 13 motors at high load. Solid circles are the average of torque ratios for each motor using torques in H2O medium before and after the D2O measurement, and the error bar was calculated using the difference of torques in H2O medium before and after the D2O measurement. The open circle with the error bar is the mean ± SD for all 13 motors (1.08 ± 0.06).
