Fig. 4
From: Using hybridization networks to retrace the evolution of Indo-European languages
Explicit hybridization network given by our algorithm for the group of 84 IE languages originally considered by Dyen et al. [32]. The tree topology in this network corresponds to the IE language phylogeny inferred by Gray and Atkinson (see Fig. 1 in [6]). Language groups are indicated on the left. The numbers at the arrows are the reticulation degrees corresponding to each of the donor languages and the numbers at the internal tree nodes are their age estimates