Upper panels: comparison of the fitted modeled and measured altitude distributions simultaneously for the three radars for the cases of θ_s = 90° and 70° when a head plasma volume size is set to 20% of the mean free path (i.e., L = 5). Lower panels: the contour plots for the solution space of α and (β + γ) for the fitting in which the same pair of α and (β + γ) was obtained for all three radars simultaneously.