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

For As2 (Arsenic diatomic)

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 aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000796 -0.007334 -0.022326 -0.024437 -0.072548 -0.072548 -0.073783 -0.771412 -0.771412 -0.210632 -0.019128 -0.106145 -0.022387 -0.115288
MP3=FULL         -0.067110   -0.100453              
Coupled Cluster CCSD(T)=FULL         -0.071001           -0.018031 -0.097961 -0.021164 -0.106366
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 aug-cc-pVDZ aug-cc-pVTZ