Top: number of pixels and clusters contributing to measurement of the harmonic transform Compton parameter profile in a given lθ₅₀₀ bin. See text in Sect. 3.6 for a description of the two histograms and their interplay. Bottom: relative error on the profile. The solid red line is the inverse variance weighted errors used throughout the analysis (shown as red error bars in Figs. 3 and 5). The dotted-dashed green line corresponds to bootstrap errors. The dashed blue line is the raw scatter in a given lθ₅₀₀ bin divided by the square root of the number of clusters contributing to this bin.