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

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For ()
  Energy (hartrees)
frozen core -15.4165163
correlated core -15.4239688
difference -0.0074525
  Energy (hartrees)
frozen core -15.4137209
correlated core -15.4210359
difference -0.0073150
  Energy (hartrees)
frozen core -15.4202637
correlated core -15.4283602
difference -0.0080965