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

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For ()
  Energy (hartrees)
frozen core -254.5889920
correlated core -254.6989598
difference -0.1099679
  Energy (hartrees)
frozen core -254.5935216
correlated core -254.6758253
difference -0.0823037
  Energy (hartrees)
frozen core -254.5902329
correlated core -254.7151064
difference -0.1248734