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Energy differences between frozen core and full core for QCISD(T)/6-31G*

19 06 19 13 52
For NaCl (Sodium Chloride)
  Energy (hartrees)
frozen core -376.5928167
correlated core -376.6087601
difference -0.0159434
  Energy (hartrees)
frozen core -376.5902263
correlated core -376.6062364
difference -0.0160101