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Compton wavelength†  Numerical value  2.426 310 235 38 x 10-12 m  Standard uncertainty  0.000 000 000 76 x 10-12 m   Relative standard uncertainty  3.1 x 10-10  Concise form  2.426 310 235 38(76) x 10-12 m     †The full description of unit m is meter per cycle.   Source: 2022 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant