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

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For ()
  Energy (hartrees)
frozen core -579.1801530
correlated core -579.2738213
difference -0.0936682
  Energy (hartrees)
frozen core -579.2129035
correlated core -579.3040416
difference -0.0911381
  Energy (hartrees)
frozen core -579.2411443
correlated core -579.3323548
difference -0.0912105
  Energy (hartrees)
frozen core -579.2251480
correlated core -579.3169525
difference -0.0918045