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Energy differences between frozen core and full core for MP2/daug-cc-pVDZ

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For ()
  Energy (hartrees)
frozen core -580.3259181
correlated core -580.3431850
difference -0.0172669
  Energy (hartrees)
frozen core -580.3264232
correlated core -580.3437304
difference -0.0173072
  Energy (hartrees)
frozen core -580.2900262
correlated core -580.3079953
difference -0.0179690