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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 IF atoms 1 and 2

For IF (Iodine monofluoride)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
Methods with standard basis sets
3-21G 3-21G* 6-311G*
Moller Plesset perturbation MP2=FULL 0.0006 0.0002 0.0045
B2PLYP=FULL 0.0001    
Coupled Cluster CCSD(T)=FULL 0.0008 0.0004 -0.0003
3-21G 3-21G* 6-311G*