Histograms of fiber parameters derived from the model dependent calculations of Sect. 5.4; 209 individual fibers were used. Top panel: height, z₁, of the fiber onset and the extent in height, δz, from the fiber onset to the decay. Middle panel: radius, r, of the assumed circular magnetic loop and the loop mirror ratio, a_m. Bottom panel: magnetic field, B₀ at the loop footpoints and the magnetic scale height H_m. The dashed vertical lines in each histogram mark the median of the respective dataset.