Upper panel: absolute difference between the standard CMB spectrum and the ones modified for E^∗ = 10^-4 eV (solid curve) and for E^∗ = 5 × 10^-9 eV (dashed curve). Lower panel: absolute difference between the standard thermal SZE for kT = 15 keV and τ = 1 × 10^-2 and the ones modified with E^∗ = 10^-4 eV (solid curve) and for E^∗ = 5 × 10^-9 eV (dashed curve), between the standard non-thermal SZE (Colafrancesco et al. 2003) for p₁ = 10, s = 2.7, and τ = 1 × 10^-4 and the ones modified with E^∗ = 10^-4 eV (red, long-dashed curve) and for E^∗ = 5 × 10^-9 eV (red, dot-dashed curve), and between the standard non-relativistic SZE for y₀ = 1 × 10^-5 and the ones modified with E^∗ = 10^-4 eV (blue, dotted curve) and for E^∗ = 5 × 10^-9 eV (blue, three-dot-dashed curve).