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

For O3H+ (protonated ozone)

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) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000342 -0.003096 -0.003096 0.026438 -0.007305 -0.007410 -0.008234 -0.055796 -0.055892 -0.020983 -0.067778 -0.051115 -0.006233 -0.038506 -0.088823 -0.006992 -0.044289 -0.091499 -0.007302 -0.046266
MP3=FULL         -0.006725   -0.007645       -0.069408 -0.052262 -0.005713 -0.038666         -0.006764 -0.047103
MP4=FULL   -0.011243     -0.006634       -0.056648   -0.069370   -0.005592 -0.038199   -0.006331 -0.044243   -0.006631 -0.046323
B2PLYP=FULL -0.000096 -0.001596 -0.001596 -0.000908 -0.002128 -0.002157 -0.002392 -0.015696 -0.015723 -0.005998 -0.019151 -0.014393 -0.001812 -0.011040   -0.002036 -0.012670   -0.002124 -0.013228
Quadratic configuration interaction QCISD(T)=FULL         -0.006520           -0.069078   -0.005545 -0.037898   -0.006307 -0.043955   -0.006590 -0.046093
QCISD(TQ)=FULL         -0.012136   -0.007385           -0.005516 -0.037922   -0.012120 -0.060274      
Coupled Cluster CCSD=FULL         -0.006515         -0.020556 -0.068549 -0.051921 -0.005493 -0.037824 -0.090096 -0.006231 -0.044020 -0.088509 -0.006518 -0.046128
CCSD(T)=FULL         -0.006591           -0.069168 -0.052232 -0.005569 -0.038095 -0.091036 -0.006338 -0.044205 -0.092451 -0.006628 -0.046320
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVDZ daug-cc-pVTZ