Correlation of the frequency position of the maximum ν_max (upper panel) and of the crossover ν₀ (lower panel) of the non-thermal SZE from RG lobes as a function of the electron energy density at the center of the radio lobes for the seven objects we study here. The lowest frequency Herschel-SPIRE band ( ≈ 447 − 666 GHz, as enclosed by the magenta lines) is shown for comparison.