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

For SO2- (Sulfur dioxide anion)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000665 -0.008917 -0.016794 -0.005368 -0.017113 -0.017113 -0.018445 -0.157773 -0.157773 -0.038426 -0.011365 -0.060664 -0.066434
MP3=FULL         -0.016124   -0.057940            
Coupled Cluster CCSD(T)=FULL         7.016519                
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ aug-cc-pVTZ