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Energy differences between frozen core and full core for MP2/6-31G**

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -1071.4082520
correlated core -1071.4412049
difference -0.0329530
  Energy (hartrees)
frozen core -1071.4060998
correlated core -1071.4390791
difference -0.0329793