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

For C2O4-- (oxalate 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
Moller Plesset perturbation MP2=FULL -0.001011 -0.010494 -0.010494 -0.006787 -0.020646 -0.020646 -0.021931 -0.112526 -0.112526 -0.046099 -0.013232 -0.080542
MP3=FULL         -0.019761   -0.109102          
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