Predicted value of as a function of the cluster radius in units of r₅₀₀. The blue lines refer to the predictions computed assuming GR, the green lines refer to the sDGP predictions, and the red lines refer to f(R) gravity theory. For each colour, the dashed line shows the gravitational effect only, the dotted line the TD effect, the dot-dashed line the SB effect, and the solid line shows the combined effect.