Equal-weighted stacks of reconstructed SZ maps (i.e., Comptonization parameter maps) for objects in six mass bins centred, from left to right and top to bottom, at log ₁₀(M_∗/M_⊙) =  [11.05,11.15,11.25,11.35,11.45,11.55] . In all cases, the bin size is taken to be 0.2, so the galaxies in two consecutive panels partially overlap. Maps are 2° on a side, with Galactic north at the top. The SZ signal traced by the central galaxies is clearly detected in all bins above log ₁₀(M_∗/M_⊙) = 11.25. In all panels, the circles indicate the FWHM of the data, which corresponds to 10′.