Left panel: diffuse flux density vs. control fields average flux density. Symbols: colored dots are clusters with reprocessed NVSS datasets; black filled dots are known RH clusters; and the black open dot is the mini-halo. The red line is the 1:1 line. Right panel: excess of diffuse flux with respect to the average control fields flux densities. Black asterisks represent the expected radio power of the RH on the basis of the P_1.4−M₅₀₀ correlation (Cassano et al. 2013).