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Energy differences between frozen core and full core for CCSD/6-311+G(3df,2p)

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For ()
  Energy (hartrees)
frozen core -580.4143010
correlated core -580.7404846
difference -0.3261836
  Energy (hartrees)
frozen core -580.4149615
correlated core -580.7411465
difference -0.3261850
  Energy (hartrees)
frozen core -580.3791392
correlated core -580.7066805
difference -0.3275413