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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 -115.3420517
correlated core -115.3808154
difference -0.0387637
  Energy (hartrees)
frozen core -115.3449213
correlated core -115.3837038
difference -0.0387825