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

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For ()
  Energy (hartrees)
frozen core -1590.9296071
correlated core -1592.2556031
difference -1.3259960
  Energy (hartrees)
frozen core -1590.9537133
correlated core -1592.2793091
difference -1.3255958
  Energy (hartrees)
frozen core -1590.9509938
correlated core -1592.2764509
difference -1.3254571