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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 -412.6763001
correlated core -412.8275889
difference -0.1512887
  Energy (hartrees)
frozen core -412.6795030
correlated core -412.8307764
difference -0.1512734