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

For AsSe (Arsenic monoselenide)

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) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.000466 -0.027187 -0.040373 -0.044373 -0.068672 -0.087022 -0.088035 -0.782693 -0.763707 -0.200578 -0.854707 -0.187197 -0.036966 -0.118651 -0.158926 -0.021898 -0.109745 -0.178669
MP3=FULL         -0.063855   -0.065154       -0.750824 -0.137866 -0.016160 -0.085937        
MP4=FULL   -0.006719     -0.068048       -0.726376   -0.811904   -0.017950 -0.098635   -0.021332 -0.107047  
B2PLYP=FULL -0.000187 -0.002145 -0.006730 -0.006998 -0.021985 -0.021985 -0.022372 -0.227390 -0.227390 -0.063575 -0.254513 -0.050844 -0.005848 -0.030910   -0.006875 -0.033376  
Quadratic configuration interaction QCISD(T)=FULL         -0.066900           -0.792196   -0.017413 -0.093840   -0.020685 -0.101635  
Coupled Cluster CCSD=FULL         -0.064818         -0.185557 -0.780912 -0.146515 -0.016426 -0.089841 -0.140216 -0.019508 -0.097511 -0.142903
CCSD(T)=FULL         -0.066878           -0.791731 -0.151073 -0.017405 -0.093633   -0.020657 -0.101387  
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ