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Energy differences between frozen core and full core for CCSD(T)/6-311+G(3df,2p)

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For ()
  Energy (hartrees)
frozen core -1590.8878560
correlated core -1591.5479722
difference -0.6601162
  Energy (hartrees)
frozen core -1590.9151646
correlated core -1591.5749521
difference -0.6597875
  Energy (hartrees)
frozen core -1590.9119375
correlated core -1591.5715874
difference -0.6596499