The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
helion-proton mass ratio
 $m_{\rm h}/m_{\rm p}$
 Numerical value  2.993 152 671 67
 Standard uncertainty  0.000 000 000 13
  Relative standard uncertainty  4.4 x 10-11
 Concise form  2.993 152 671 67(13)    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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