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

For BrOCl (Bromine hypochlorite)

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 -0.000188 -0.009545 -0.023908 -0.014438 -0.040037 -0.040038 -0.041860 -0.461572 -0.461572 -0.110590 -0.016068 -0.091574 -0.019922 -0.100281
MP3=FULL         -0.037358   -0.062542              
Coupled Cluster CCSD(T)=FULL         -0.038040           -0.014590 -0.086867 -0.018343 -0.095331
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