Mean SZ signal vs. stellar mass for locally brightest galaxies. Thick error bars trace the uncertainty on the bin average due purely to measurement error, while thin bars with large terminators show the variance calculated by bootstrap resampling and so also include the intrinsic scatter in the signal. The inset provides a view on a linear scale to better evaluate the significance of the detections. We observe a clear relation between the mean SZ signal and stellar mass down to log ₁₀(M_∗/M_⊙) = 11.25 (the detection in this bin is at 3.5σ), with a suggestion of signal to lower mass: the next three bins show signal at 1.6σ, 1.6σ and 2.6σ, respectively.