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

19 06 19 13 52
For HF (Hydrogen fluoride)
  Energy (hartrees)
frozen core -151.5906523
correlated core -151.6128404
difference -0.0221882
  Energy (hartrees)
frozen core -151.5928606
correlated core -151.6146808
difference -0.0218202