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Click symbol for equation reduced proton Compton wavelength  Numerical value  2.103 089 103 36 x 10-16 m  Standard uncertainty  0.000 000 000 64 x 10-16 m   Relative standard uncertainty  3.1 x 10-10  Concise form  2.103 089 103 36(64) 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