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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 -169.4388693
correlated core -169.4453556
difference -0.0064863
  Energy (hartrees)
frozen core -169.4486663
correlated core -169.4551671
difference -0.0065008
  Energy (hartrees)
frozen core -169.4443963
correlated core -169.4508803
difference -0.0064840