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

19 06 19 13 52
For AlCl (Aluminum monochloride)
  Energy (hartrees)
frozen core -79.6609807
correlated core -79.6941719
difference -0.0331913
  Energy (hartrees)
frozen core -79.6564863
correlated core -79.6894009
difference -0.0329146