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Energy differences between frozen core and full core for MP4/6-31G*

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For ()
  Energy (hartrees)
frozen core -169.3958625
correlated core -169.4061891
difference -0.0103266
  Energy (hartrees)
frozen core -169.4069073
correlated core -169.4172626
difference -0.0103553
  Energy (hartrees)
frozen core -169.4017010
correlated core -169.4120366
difference -0.0103356