The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
Rydberg constant times hc in eV
 $hc\,R_\infty$
 Numerical value  13.605 693 122 994 eV
 Standard uncertainty   0.000 000 000 026 eV
  Relative standard uncertainty  1.9 x 10-12
 Concise form  13.605 693 122 994(26) eV    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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