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Bond Length differences between FULL (all electrons correlated) and FROZEN core

Such as MP2=Frozen and MP2=Full
17 10 27 16 27

For SeF atoms 1 and 2

For SeF (Selenium monofluoride)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL 0.0000 0.0006 0.0003 0.0018 0.0031 0.0031 0.0038   0.0007 0.0129 -0.0005 0.0011 0.0031 0.0007 0.0025 0.0080 0.0046
MP3=FULL         0.0030   0.0034       -0.0005 0.0010 0.0026        
MP4=FULL   0.0006     0.0033       0.0004     0.0012 0.0032   0.0027 0.0084  
B2PLYP=FULL 0.0000 0.0002 0.0001 0.0006 0.0009 0.0009 0.0017 0.0001 0.0001 0.0039 -0.0002 0.0003 0.0009   0.0008 0.0023  
Quadratic configuration interaction QCISD(T)=FULL         0.0032             0.0012 0.0030   0.0025 0.0079  
Coupled Cluster CCSD=FULL         0.0031           -0.0002 0.0011 0.0030 0.0010 0.0023 0.0077 0.0045
CCSD(T)=FULL         0.0032           -0.0003 0.0012 0.0029 0.0012 0.0025 0.0078 0.0046
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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ

sef.gif