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

For BF3- (Borane, trifluoro- 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 aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.000474 -0.006865 -0.006865 -0.004454 -0.012135 -0.012135 -0.013430 -0.073902 -0.073902 -0.022323 -0.008280 -0.051297 -0.118823 -0.010010 -0.058928 -0.120771
MP3=FULL         -0.011652   -0.077986                  
Coupled Cluster CCSD(T)=FULL         5.233463           -0.007676 -0.051549   -0.009439 -0.059732  
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 aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ