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

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  Energy (hartrees)
frozen core -163.5014038
correlated core -163.5020239
difference -0.0006201
  Energy (hartrees)
frozen core -163.5053303
correlated core -163.5059387
difference -0.0006084
  Energy (hartrees)
frozen core -163.4951707
correlated core -163.4958431
difference -0.0006724