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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 -151.5862331
correlated core -151.6444239
difference -0.0581909
  Energy (hartrees)
frozen core -151.5923843
correlated core -151.6501850
difference -0.0578007