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Energy differences between frozen core and full core for MP2/STO-3G

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  Energy (hartrees)
frozen core -572.2347733
correlated core -572.2406945
difference -0.0059212
  Energy (hartrees)
frozen core -572.2824089
correlated core -572.2884154
difference -0.0060066
  Energy (hartrees)
frozen core -572.2867804
correlated core -572.2926478
difference -0.0058674
  Energy (hartrees)
frozen core -572.2759473
correlated core -572.2819309
difference -0.0059836