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Energy differences between frozen core and full core for MP2/3-21G

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For ()
  Energy (hartrees)
frozen core -575.9352168
correlated core -575.9466900
difference -0.0114732
  Energy (hartrees)
frozen core -575.9639537
correlated core -575.9755161
difference -0.0115623
  Energy (hartrees)
frozen core -575.9563520
correlated core -575.9679251
difference -0.0115731
  Energy (hartrees)
frozen core -575.9594949
correlated core -575.9710703
difference -0.0115754