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

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For ()
  Energy (hartrees)
frozen core -580.4398042
correlated core -580.5582678
difference -0.1184636
  Energy (hartrees)
frozen core -580.4411100
correlated core -580.5594353
difference -0.1183253
  Energy (hartrees)
frozen core -580.4052782
correlated core -580.5241649
difference -0.1188868