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

19 06 19 13 52
For C5H6O (Pentadienal)
  Energy (hartrees)
frozen core -151.5356483
correlated core -151.5419688
difference -0.0063205
  Energy (hartrees)
frozen core -151.5412034
correlated core -151.5473437
difference -0.0061403