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

For NaCl- (sodium chloride 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 cc-pVQZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL -0.040047 -0.005422 -0.013470 -0.004214 -0.012271 -0.012271 -0.012975 -0.180087 -0.180087 -0.029128 -0.007305 -0.044921 -0.075824 -0.115869
MP3=FULL         -0.011342   -0.021738              
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 cc-pVQZ cc-pV(T+d)Z