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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 -580.1230796
correlated core -580.1305130
difference -0.0074333
  Energy (hartrees)
frozen core -580.1247857
correlated core -580.1322435
difference -0.0074577
  Energy (hartrees)
frozen core -580.0696327
correlated core -580.0772031
difference -0.0075704