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Tree topology along which the sequences have been simulated. Four different tree lengths have been analyzed. The trees are described by giving the length of branches 1 to 6: tree T0 = {1, 1, 2, 2, 2, 2}; tree T1 = {2, 2, 4, 4, 4, 4}; tree T2 = {2, 2, 8, 4, 8, 4} and tree T3 = {5, 4, 8, 12, 10, 15}.
