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Energy differences between frozen core and full core for CCSD/TZVP

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For ()
  Energy (hartrees)
frozen core -15.4020689
correlated core -15.4168227
difference -0.0147538
  Energy (hartrees)
frozen core -15.4000660
correlated core -15.4148635
difference -0.0147974
  Energy (hartrees)
frozen core -15.4023167
correlated core -15.4170943
difference -0.0147776