Bundle of power-law spectra, F(ν) ∝ ν− α, with α = 1.1, 1.22, 1.4, 1.55, 1.7 normalized to the flux of the radio halo derived from Brown & Rudnick (2011) WSRT data using an aperture radius RH = 0.85 R500. Models are corrected for the SZ-decrement (Fobs(ν,ΩH) = F(ν,ΩH) + δFSZ(ν,ΩH), Sect. 2) measured on the same aperture radius. The observed high-frequency points are taken from T03.
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