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Energy differences between frozen core and full core for MP4/6-311G**

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -40.2681718
correlated core -40.2877151
difference -0.0195434
  Energy (hartrees)
frozen core -40.2681735
correlated core -40.2877168
difference -0.0195433