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Energy differences between frozen core and full core for CCSD(T)/6-31G*

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  Energy (hartrees)
frozen core -579.0312420
correlated core -579.0523072
difference -0.0210652
  Energy (hartrees)
frozen core -579.0687830
correlated core -579.0896007
difference -0.0208177
  Energy (hartrees)
frozen core -579.0857352
correlated core -579.1069219
difference -0.0211867
  Energy (hartrees)
frozen core -579.0733499
correlated core -579.0945473
difference -0.0211974