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Energy differences between frozen core and full core for CCSD/cc-pVDZ

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For ()
  Energy (hartrees)
frozen core -580.3566912
correlated core -580.3696326
difference -0.0129415
  Energy (hartrees)
frozen core -580.3579582
correlated core -580.3707853
difference -0.0128271
  Energy (hartrees)
frozen core -580.3250108
correlated core -580.3376940
difference -0.0126833