The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
Angstrom star
 \AA$^{\ast}$
 Numerical value  1.000 014 95 x 10-10 m
 Standard uncertainty  0.000 000 90 x 10-10 m
  Relative standard uncertainty  9.0 x 10-7
 Concise form  1.000 014 95(90) x 10-10 m    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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