The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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deuteron rms charge radius
 $r_{\rm d}$
 Numerical value  2.127 99 x 10-15 m
 Standard uncertainty  0.000 74 x 10-15 m
  Relative standard uncertainty  3.5 x 10-4
 Concise form  2.127 99(74) x 10-15 m    
 
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

 
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