An example illustrates the BLD measure scheme; FMinD at the point
pref is marked as ①. During the BMaxD calculation ② and ③ are the
candidates. Since BMaxD selects the maximum distance among the candidates, ② is chosen as BMaxD. The
final BLD(pref, T) is the maximum between FMinD and
BMaxD. Therefore, BMaxD, ② is chosen as the final BLD(pref,
T) in this example.