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Energy differences between frozen core and full core for MP2/6-31G

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For ()
  Energy (hartrees)
frozen core -578.8983872
correlated core -578.9060335
difference -0.0076464
  Energy (hartrees)
frozen core -578.9305866
correlated core -578.9381975
difference -0.0076109
  Energy (hartrees)
frozen core -578.9269335
correlated core -578.9345299
difference -0.0075964
  Energy (hartrees)
frozen core -578.9271179
correlated core -578.9347510
difference -0.0076331