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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 -76.1476961
correlated core -76.1667690
difference -0.0190729
  Energy (hartrees)
frozen core -76.1476960
correlated core -76.1667689
difference -0.0190729