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Energy differences between frozen core and full core for B2PLYP/6-31G**

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For ()
  Energy (hartrees)
frozen core -581.0143767
correlated core -581.0212472
difference -0.0068705
  Energy (hartrees)
frozen core -581.0158101
correlated core -581.0226925
difference -0.0068824
  Energy (hartrees)
frozen core -580.9760765
correlated core -580.9830306
difference -0.0069541