Examples of echoes for which model fits were possible. The two echoes in the left panels are for transverse polarizations while the two in the right panels are for parallel polarizations. The characteristics of the echoes are given in the title to each plot as are the model fits of D, r₀, q. The pulse-to-pulse received power as a function of time are shown as black X’s at all three frequencies while the model power as a function of time is shown in red.