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Click symbol for equation fine-structure constant  Value  7.297 352 5376 x 10-3  Standard uncertainty  0.000 000 0050 x 10-3   Relative standard uncertainty   6.8 x 10-10  Concise form  7.297 352 5376(50) x 10-3       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