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Click symbol for equation Thomson cross section  Value  0.665 245 8558 x 10-28 m2  Standard uncertainty  0.000 000 0027 x 10-28 m2   Relative standard uncertainty   4.1 x 10-9  Concise form  0.665 245 8558(27) x 10-28 m2       Click here for correlation coefficient of this constant with other constants Source: 2006 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant