Shape biases in the Planck simulation averaged over bins in ν = δ_c/σ(M, z), the peak-significance, as a function of linear density bias (b₁), also averaged over bins of ν. Different colors represent the redshifts indicated in the legend. Each panel shows the orthogonal distance of the measurements to the fit, in units of the measurement error. The postulated functions provide a good description of the relations between the shape biases and b₁.