Fig. 1.

Three different models of four sequences of two sites each, TT, TG, GG, and GT, from four taxa A, B, C, and D, respectively. a A data-display network that accommodates the two conflicting splits AB |CD and BC |AD. b An evolutionary network that explicitly models a reticulation event involving taxon B. c A tree model that would fit the data if, for example, a recurrent mutation occurred at the second site