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

19 06 19 13 52
For CO+ (carbon monoxide cation)
  Energy (hartrees)
frozen core -580.4451783
correlated core -580.5717366
difference -0.1265584
  Energy (hartrees)
frozen core -580.4463727
correlated core -580.5725911
difference -0.1262184