The measured values of σ_tot(τ), with points colored as in Figure 3. Horizontal error bars indicate the standard deviation of the ages in each bin, while vertical error bars indicate the ±1σ range around the best-fit values of σ_tot. The cyan dashed curve is the best-fit model of the form of Equation (21), while the red dotted curve shows the result of using parameters derived from K. Kreckel et al. (2019) and N. Frankel et al. (2020). The shaded regions indicate the range of model curves obtained by varying the fitted σ_f and ﹩{\langle {(\delta {R}_{{\rm{g}}})}^{2}\rangle }_{0}﹩ by their respective ±1σ statistical uncertainties.