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atomic unit of 1st hyperpolarizability  Numerical value  3.206 361 3061 x 10-53 C3 m3 J-2  Standard uncertainty  0.000 000 0015 x 10-53 C3 m3 J-2   Relative standard uncertainty  4.5 x 10-10  Concise form  3.206 361 3061(15) x 10-53 C3 m3 J-2       Click here for correlation coefficient of this constant with other constants Source: 2018 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant