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Energy differences between frozen core and full core for CCSD/6-31G(2df,p)

19 06 19 13 52
For S (Sulfur atom)
  Energy (hartrees)
frozen core -166.1747615
correlated core -166.2017916
difference -0.0270301
  Energy (hartrees)
frozen core -166.1758058
correlated core -166.2027742
difference -0.0269684