This triangular graph presents the relationship between the transmission factor B and the number of half-values, N or tenth-values layers, n of a barrier. The vertical axis is logarithmic and represents the relative transmission factor, B. The horizontal axis represents the number of half-value layers, N. The diagonal axis represents the number of tenth-value layers, n. The graph shows that as the transmission factor increases, the corresponding number of half-value layers or tenth-value layers decrease.