The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
neutron gyromagnetic ratio in MHz/T
 $\gamma_{\rm n}$
 Numerical value  29.164 6931 MHz T-1
 Standard uncertainty   0.000 0069 MHz T-1
  Relative standard uncertainty  2.4 x 10-7
 Concise form  29.164 6931(69) MHz T-1    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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