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

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -77.0932777
correlated core -77.1387856
difference -0.0455079
  Energy (hartrees)
frozen core -77.1319351
correlated core -77.1764074
difference -0.0444723