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

For Cl3- (trichloride 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) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000104 -0.013471 -0.035882 -0.008381 -0.030132 -0.030132 -0.032069 -0.146849 -0.146849 -0.059189 -0.081187 -0.018137 -0.099729 -0.021324 -0.104791
MP3=FULL         -0.027439   -0.042919                
MP4=FULL   -0.012321     -0.027916       -0.146302     -0.016137 -0.096307 -0.019332 -0.101453
Coupled Cluster CCSD=FULL         -0.027105           -0.077558 -0.015492 -0.093675 -0.018459 -0.098661
CCSD(T)=FULL         -0.027804           -0.078947 -0.016072 -0.095851 -0.019151 -0.100919
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ