Upper panel: SZE calculated for Coma (with kT = 8.2 keV and τ = 6.55 × 10^-3) for E^∗ = 0 (solid), 5 × 10^-9 (dashed), and 1 × 10^-5 (dot-dashed) eV. Lower panel: SZE calculated for A2163 (with kT = 12.4 keV and τ = 1.56 × 10^-2) for E^∗ = 0 (solid), 5 × 10^-9 (dashed), 5 × 10^-6 (3 dot-dashed), and 1 × 10^-5 (dot-dashed) eV. The Coma parameters are taken from Hughes et al. (1989) and Briel et al. (1992), and from Elbaz et al. (1995) and Markevitch et al. (1996) for A2163.