Figure 1.

Notation. For the tree depicted we have: $n=7$ taxa, the ranked topology $\psi$ = (((a,(b,c):1):3,d):5,((e,f):2,g):4) in NEWICK format, with internal nodes marked by rank, $\phi$ = ({e,f,g}, {b,c}, {a,b,c,d}), $K=3$ calibrated nodes marked in red, and $i(\psi )=(3,6,2)$, $\overline{i}(\psi )=(3,1,2)$, $\hat{i}(\psi )=(2,3,6)$ and $h_{\psi }=(h_3,h_6,h_2)$.