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Click symbol for equation reduced tau Compton wavelength  Numerical value  1.110 538 x 10-16 m  Standard uncertainty  0.000 075 x 10-16 m   Relative standard uncertainty  6.8 x 10-5  Concise form  1.110 538(75) x 10-16 m       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