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

For SiCl+ (silicon monochloride cation)

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 -0.003134 -0.010303 -0.025261 -0.006625 -0.021002 -0.021002 -0.022770 -0.173648 -0.173647 -0.040753 -0.012227 -0.089496 -0.106719 -0.212818
MP3=FULL         -0.019810   -0.023693              
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