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proton gyromagnetic ratio over 2 pi  Value  42.577 478 92 MHz T-1  Standard uncertainty   0.000 000 29 MHz T-1   Relative standard uncertainty   6.9 x 10-9  Concise form  42.577 478 92(29) MHz T-1       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