The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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hartree-atomic mass unit relationship
$(1 \ E_{\rm h})/c^2$
 Value  2.921 262 3197 x 10-8 u
 Standard uncertainty  0.000 000 0013 x 10-8 u
  Relative standard uncertainty   4.5 x 10-10
 Concise form  2.921 262 3197(13) x 10-8 u    
 
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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