  Using a simple final-state rescattering model coupled with a simple Coulomb
model, the effects of the central Coulomb potential on pion interferometry
measurements in 158 GeV/nucleon Pb+Pb collisions are explored. Although the
central Coulomb potential does not introduce correlations between pions, it
does prevent an accurate measurement of the momentum difference. This momentum
difference smearing effect leads to a reduction in the measured correlation
radii and lambda parameters. These distortions are important in 158 GeV/nucleon
Pb+Pb collisions because of large source sizes and the strong central Coulomb
potential.
