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Energy differences between frozen core and full core for MP4/6-311G**

19 06 19 13 52
For ()
  Energy (hartrees)
frozen core -76.9890810
correlated core -77.0280207
difference -0.0389397
  Energy (hartrees)
frozen core -77.0595654
correlated core -77.0979298
difference -0.0383644