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

For BeCl (beryllium monochloride)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL -0.000447 -0.005193 -0.013942 -0.013942 -0.014600 -0.064164 -0.064165     -0.084211 -0.008447   -0.113633
MP3=FULL     -0.013201   -0.016772                
B2PLYP=FULL     -0.004210   -0.004408                
Coupled Cluster CCSD(T)=FULL     -0.013426         -0.006487 -0.041971   -0.007775 -0.048553  
STO-3G 3-21G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z