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Energy differences between frozen core and full core for MP4/cc-pVTZ

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For ()
  Energy (hartrees)
frozen core -254.5837668
correlated core -254.6229534
difference -0.0391866
  Energy (hartrees)
frozen core -254.5888947
correlated core -254.6284381
difference -0.0395434
  Energy (hartrees)
frozen core -254.5837819
correlated core -254.6220369
difference -0.0382550