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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 -254.4503942
correlated core -254.4611575
difference -0.0107632
  Energy (hartrees)
frozen core -254.4564226
correlated core -254.4666212
difference -0.0101986
  Energy (hartrees)
frozen core -254.4464679
correlated core -254.4569197
difference -0.0104518