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Energy differences between frozen core and full core for MP2/6-311G**

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -761.4973561
correlated core -761.8728786
difference -0.3755225
  Energy (hartrees)
frozen core -761.4973560
correlated core -761.8728785
difference -0.3755225