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

For ClONO (chlorine nitrite)

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) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000441 -0.009791 -0.017253 -0.006003 -0.018561 -0.018561 -0.020093 -0.105105 -0.105105 -0.042662 -0.078347 -0.012388 -0.071736 -0.014671 -0.079978
MP3=FULL         -0.017142   -0.018658       -0.078745 -0.011102 -0.070437    
MP4=FULL   -0.009055     -0.017190       -0.105971     -0.011131 -0.070569    
B2PLYP=FULL -0.000131 -0.002916 -0.005149 -0.001779 -0.005503 -0.005503 -0.005955 -0.029972 -0.029972 -0.012500 -0.022449 -0.003685 -0.021024 -0.004356 -0.023401
Quadratic configuration interaction QCISD(T)=FULL         -0.017121             -0.011075 -0.070660 -0.013291 -0.079432
Coupled Cluster CCSD=FULL         -0.016841         -0.040271 -0.078359 -0.010829 -0.069715 -0.013009 -0.078598
CCSD(T)=FULL         -0.017141           -0.079119 -0.011088 -0.070719    
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ