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Energy differences between frozen core and full core for CCSD/cc-pVTZ

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For ()
  Energy (hartrees)
frozen core -580.4267255
correlated core -580.5427776
difference -0.1160521
  Energy (hartrees)
frozen core -580.4274596
correlated core -580.5433486
difference -0.1158890
  Energy (hartrees)
frozen core -580.3931722
correlated core -580.5096181
difference -0.1164460