The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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shielding difference of t and p in HT
 $\sigma_{\rm tp}$
 Numerical value  2.394 50 x 10-8
 Standard uncertainty  0.000 20 x 10-8
  Relative standard uncertainty  8.4 x 10-5
 Concise form  2.394 50(20) x 10-8    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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