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Energy differences between frozen core and full core for MP2/6-311G*

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For ()
  Energy (hartrees)
frozen core -580.2812358
correlated core -580.5288551
difference -0.2476193
  Energy (hartrees)
frozen core -580.2828684
correlated core -580.5306073
difference -0.2477389
  Energy (hartrees)
frozen core -580.2359783
correlated core -580.4844429
difference -0.2484645