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atomic unit of electric field gradient  Value  9.717 362 356 x 1021 V m-2  Standard uncertainty  0.000 000 060 x 1021 V m-2   Relative standard uncertainty   6.2 x 10-9  Concise form  9.717 362 356(60) x 1021 V m-2       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