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

For Be2+ (Beryllium diatomic cation)

Energies in Hartree
Methods with standard basis sets
6-31G* 6-31+G** aug-cc-pVDZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL     -0.001639 -0.016146
MP3=FULL -0.006926 -0.007303    
6-31G* 6-31+G** aug-cc-pVDZ cc-pV(T+d)Z