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Energy differences between frozen core and full core for QCISD(T)/daug-cc-pVDZ

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For ()
  Energy (hartrees)
frozen core -579.1077736
correlated core -579.1238625
difference -0.0160889
  Energy (hartrees)
frozen core -579.1446802
correlated core -579.1597910
difference -0.0151108
  Energy (hartrees)
frozen core -579.1704260
correlated core -579.1860777
difference -0.0156517
  Energy (hartrees)
frozen core -579.1551192
correlated core -579.1706698
difference -0.0155506