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Energy differences between frozen core and full core for MP2/6-31G*

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For ()
  Energy (hartrees)
frozen core -15.3877283
correlated core -15.3910267
difference -0.0032984
  Energy (hartrees)
frozen core -15.3817157
correlated core -15.3850204
difference -0.0033047
  Energy (hartrees)
frozen core -15.3879043
correlated core -15.3912930
difference -0.0033887