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

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For ()
  Energy (hartrees)
frozen core -579.0926619
correlated core -579.1081586
difference -0.0154967
  Energy (hartrees)
frozen core -579.1278513
correlated core -579.1423610
difference -0.0145096
  Energy (hartrees)
frozen core -579.1587965
correlated core -579.1739139
difference -0.0151174
  Energy (hartrees)
frozen core -579.1411017
correlated core -579.1561151
difference -0.0150134