Fig. 8

Five trees \(T_7,T_8,T_9,T_{10},T_{11}\), used to compare the bottom-up distance \(\mathrm {D_{BU}}\), the subtree distance \(\mathrm {D_{ST}}\), the best-match metric \(\mathrm {D_{BM}}\), and the left-regular metric \(\mathrm {D_{LR}}\)