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

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  Energy (hartrees)
frozen core -579.1208766
correlated core -579.2487358
difference -0.1278592
  Energy (hartrees)
frozen core -579.1507586
correlated core -579.2719854
difference -0.1212268
  Energy (hartrees)
frozen core -579.1813260
correlated core -579.3052643
difference -0.1239384
  Energy (hartrees)
frozen core -579.1657378
correlated core -579.2892011
difference -0.1234633