Histograms of fiber parameters derived from the least square fit of the drift rate of 38 outbound typical fiber groups (top) and the tracks of 209 individual fibers of the same class (bottom). x₁, x₂ are the start and end values of x, Δx their difference, H_f/cosθ the frequency scale length along the exciter trajectory, B₁, B₂ the magnetic field at the start and at the end of the fibers.