Fig. 4

An example of different epochs yielding the same number of nodes and links. a Epoch A, b sampling pulse of epoch A, c a_i = a₁, a₂, a₃,… a_n, d vertical visibility algorithm of epoch B, e epoch B, f sampling pulse of epoch B, g b_i = b₁, b₂, b₃,… b_n, and h vertical visibility algorithm of epoch B