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

19 06 19 13 52
For CBr2Cl2 (dibromodichloromethane)
  Energy (hartrees)
frozen core -77.0414674
correlated core -77.0711416
difference -0.0296742
  Energy (hartrees)
frozen core -77.1015988
correlated core -77.1296449
difference -0.0280461