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

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  Energy (hartrees)
frozen core -579.1162324
correlated core -579.2336488
difference -0.1174164
  Energy (hartrees)
frozen core -579.1460588
correlated core -579.2603212
difference -0.1142624
  Energy (hartrees)
frozen core -579.1762623
correlated core -579.2916244
difference -0.1153621
  Energy (hartrees)
frozen core -579.1608521
correlated core -579.2761097
difference -0.1152576