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Thomson cross section  Value  0.665 245 871 58 x 10-28 m2  Standard uncertainty  0.000 000 000 91 x 10-28 m2   Relative standard uncertainty   1.4 x 10-9  Concise form  0.665 245 871 58(91) x 10-28 m2       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