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

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For ()
  Energy (hartrees)
frozen core -580.4270563
correlated core -580.7570191
difference -0.3299627
  Energy (hartrees)
frozen core -580.4282610
correlated core -580.7582901
difference -0.3300291
  Energy (hartrees)
frozen core -580.3908598
correlated core -580.7221491
difference -0.3312893