Moving upward from below the line B (see figure 2 below), a vertical scan is carried out through the horizontal part of the &quot; cut-off &quot; at 2.5° from V-V. The inflection point (where d2 (log E) / dv2 = 0) is determined and positioned on the line B situated one per cent below H-H.
Moving upward from below the line B (see figure 2 below), a vertical scan is carried out through the horizontal part of the &quot; cut-off &quot; at 2.5° from V-V. The inflection point (where d2 (log E) / dv2 = 0) is determined and positioned on the line B situated one per cent below H-H.