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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 -40.2409355
correlated core -40.2596205
difference -0.0186851
  Energy (hartrees)
frozen core -40.2409354
correlated core -40.2596204
difference -0.0186850