EM radial profile of a filament segment, shown with a solid black line. The radial profile has been baseline- and background-subtracted. Negative distances from the spine point toward the northeast and positive distances toward the southwest with respect to the filament. The dot-dashed blue line shows the best-fit Gaussian used to compute the filament profile properties. For comparison, the dashed red line shows the best-fit Plummer profile with a power-law index of p = 4.