The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
electron-muon magnetic moment ratio
 $\mu_{\rm e}/\mu_{\rm \mu}$
 Numerical value  206.766 9883
 Standard uncertainty    0.000 0046
  Relative standard uncertainty  2.2 x 10-8
 Concise form  206.766 9883(46)    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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