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

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For ()
  Energy (hartrees)
frozen core -580.4327038
correlated core -580.5613650
difference -0.1286612
  Energy (hartrees)
frozen core -580.4333495
correlated core -580.5615363
difference -0.1281868
  Energy (hartrees)
frozen core -580.3989277
correlated core -580.5302184
difference -0.1312908