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proton Compton wavelength over 2 pi  Value  0.210 308 910 109 x 10-15 m  Standard uncertainty  0.000 000 000 097 x 10-15 m   Relative standard uncertainty   4.6 x 10-10  Concise form  0.210 308 910 109(97) x 10-15 m       Click here for correlation coefficient of this constant with other constants Source: 2014 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant