The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
shielded proton magnetic moment to nuclear magneton ratio
 $\mu^\prime_{\rm p}/\mu_{\rm N}$
 Numerical value  2.792 775 599
 Standard uncertainty  0.000 000 030
  Relative standard uncertainty  1.1 x 10-8
 Concise form  2.792 775 599(30)    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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