  The freeze-out of hot and dense hadronic matter formed in relativistic
nuclear collisions is probed by HBT interferometry of identical pions, kaons,
etc. Coulomb repulsion/attraction of positive/negative particles show up at
small particle momenta and is also very sensitive to the freeze-out conditions.
The source sizes and times freeze-out are extracted from $\pi^-/\pi^+$ spectra
and HBT radii and compared.
