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

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For ()
  Energy (hartrees)
frozen core -580.4109033
correlated core -580.5032074
difference -0.0923042
  Energy (hartrees)
frozen core -580.4110680
correlated core -580.5033349
difference -0.0922669
  Energy (hartrees)
frozen core -580.3719231
correlated core -580.4641101
difference -0.0921870