The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
Rydberg constant times c in Hz
 $R_\infty c$
 Numerical value  3.289 841 960 2508 x 1015 Hz
 Standard uncertainty  0.000 000 000 0064 x 1015 Hz
  Relative standard uncertainty  1.9 x 10-12
 Concise form  3.289 841 960 2508(64) x 1015 Hz    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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