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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 -169.4660031
correlated core -169.5224744
difference -0.0564713
  Energy (hartrees)
frozen core -169.4763448
correlated core -169.5328371
difference -0.0564923
  Energy (hartrees)
frozen core -169.4707805
correlated core -169.5272309
difference -0.0564504