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

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For ()
  Energy (hartrees)
frozen core -169.5941190
correlated core -169.6435261
difference -0.0494071
  Energy (hartrees)
frozen core -169.6025715
correlated core -169.6519746
difference -0.0494031
  Energy (hartrees)
frozen core -169.5968694
correlated core -169.6462736
difference -0.0494043