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Here is an attempt using the default TikZ trees. Although I actually prefer the syntax of forest (which also does some things better than TikZ on its own) I couldn't get the arc down to to work in forest without drowning in an ugly sea of \noexpand. The "magic" number .551 is truncated from the paper by Aleksas Riškus on approximating arcs with Bézier ...

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Here’s an attempt based somewhat on the examples in §4 of the forest manual. One advantage of a forest solution is to easily swap between tree styles, e.g. a more conventional appearance with straight edges, or even something upside-down. \documentclass{article} \usepackage{forest} \begin{document} \begin{forest} for tree={ s sep=1.5em, l sep=5em, ...

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