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tau Compton wavelength†  Numerical value  6.977 71 x 10-16 m  Standard uncertainty  0.000 47 x 10-16 m   Relative standard uncertainty  6.8 x 10-5  Concise form  6.977 71(47) x 10-16 m     †The full description of unit m is meter per cycle.   Click here for correlation coefficient of this constant with other constants Source: 2018 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant