Phylogenetic trees for Zapotec

I've been frustrated by how hard it is to draw decent language tree diagrams for historical linguistics.  Something today made me think to look at the software that evolutionary biologists use, and I found TreeGraph 2.   This is free, and produced the very nice diagrams below.

Central Zapotec languages

The tree below is the current version of something that I am working on.  It's intended to show major branches of Central Zapotec (according to the classification of Smith Stark 2007), and it also shows (in brackets and italics) where we currently have Colonial Valley Zapotec documents in our FLEx corpus.

I know that there are many other Colonial Valley Zapotec documents out there, so the tree will get 'bushier' over time, but I found this a useful graphic view of where the documents come from in terms of distribution.