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

For CSe- (Carbon monoselenide anion)

Energies in Hartree
Methods with standard basis sets
3-21G 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ
Moller Plesset perturbation MP2=FULL -0.004917 -0.012581 -0.037244 -0.037244 -0.038254 -0.397159 -0.397159 -0.103718 -0.010895
MP3=FULL     -0.034572   -0.085604        
3-21G 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ