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Energy differences between frozen core and full core for CCSD(T)/TZVP

19 06 19 13 52
For C6H6 (Benzene)
  Energy (hartrees)
frozen core -398.7892190
correlated core -398.9633252
difference -0.1741062
  Energy (hartrees)
frozen core -398.7895452
correlated core -398.9635685
difference -0.1740232