Bin averaged SZ signal from a sphere of radius R₅₀₀ (Y₅₀₀) scaled by the expected mass and angular distance dependence as a function of redshift. The Planck data (red diamonds) and the SZ cluster signal expected from the X-ray based model (blue stars) are shown together with the expected standard redshift evolution (dahed line). The best fitting model is shown by the dot-dashed line and the 1σ confidence region is limited by the dotted lines. Here M₅₀₀ is given in units of 3 × 10¹⁴M_⊙.