Comparison of parallel scatter fits. (a) Diffusion versus altitude scatter plot with color coded electron line density. (b) Initial trail radius versus altitude scatter plot with color coded electron line density. (c) Diffusion versus altitude scatter plot with color coded time of flight meteor velocity. (d) Initial trail radius versus altitude scatter plot with color coded time of flight velocity. The initial radius as a function of altitude as measured by Jones & Campbell-Brown (2005) and speed isalso shown for comparison.