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Energy differences between frozen core and full core for CCSD(T)/cc-pVDZ

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For ()
  Energy (hartrees)
frozen core -579.0954792
correlated core -579.1081598
difference -0.0126806
  Energy (hartrees)
frozen core -579.1321542
correlated core -579.1445936
difference -0.0124394
  Energy (hartrees)
frozen core -579.1572540
correlated core -579.1698589
difference -0.0126049
  Energy (hartrees)
frozen core -579.1420729
correlated core -579.1546896
difference -0.0126167