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

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  Energy (hartrees)
frozen core -166.0537654
correlated core -166.0639965
difference -0.0102311
  Energy (hartrees)
frozen core -166.0550068
correlated core -166.0652008
difference -0.0101941
  Energy (hartrees)
frozen core -166.0477688
correlated core -166.0590206
difference -0.0112518