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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 IBr atoms 1 and 2

For IBr (Iodine monobromide)
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 -0.0003 0.0013 0.0082
Coupled Cluster CCSD(T)=FULL -0.0002 0.0016 -0.0021
3-21G 3-21G* 6-311G*