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

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For ()
  Energy (hartrees)
frozen core -254.5863680
correlated core -254.6634937
difference -0.0771257
  Energy (hartrees)
frozen core -254.5911543
correlated core -254.6641935
difference -0.0730392
  Energy (hartrees)
frozen core -254.5875180
correlated core -254.6633816
difference -0.0758636