The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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Correlation coefficient between two constants
reduced Planck constant times c in MeV fm
 $ \hbar c $
 Numerical value  197.326 980 4... MeV fm
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  197.326 980 4... MeV fm    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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