The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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lattice spacing of ideal Si (220)
 $d_{220}$
 Numerical value  1.920 155 716 x 10-10 m
 Standard uncertainty  0.000 000 032 x 10-10 m
  Relative standard uncertainty  1.6 x 10-8
 Concise form  1.920 155 716(32) x 10-10 m    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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