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Energy differences between frozen core and full core for MP2/aug-cc-pVDZ

19 06 19 13 52
For CHD3 (methane-d3)
  Energy (hartrees)
frozen core -596.9528486
correlated core -596.9653439
difference -0.0124953
  Energy (hartrees)
frozen core -596.9828983
correlated core -596.9952609
difference -0.0123626