The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron-triton mass ratio
$m_{\rm e}/m_{\rm t}$
 Value  1.819 200 062 203 x 10-4
 Standard uncertainty  0.000 000 000 084 x 10-4
  Relative standard uncertainty   4.6 x 10-11
 Concise form  1.819 200 062 203(84) x 10-4    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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