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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For Al2+ (aluminum diatomic cation)

Energies in Hartree
Methods with standard basis sets
6-31G* 6-31+G**
Moller Plesset perturbation MP3=FULL -0.018009 -0.022907
6-31G* 6-31+G**