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

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -958.0302396
correlated core -958.1103876
difference -0.0801480
  Energy (hartrees)
frozen core -958.0311390
correlated core -958.1110295
difference -0.0798905