How to draw an arc on a syntax tree
suitable for “phase” illustration
the “arc” function was used with the forest package

\begin{forest}
[DP, name=DPphase [Spec][D'[\{{\small{}gen}\}][nP, name=spellout[AP][nP]]]]
\draw[dashed]([xshift=-25pt]spellout) arc[start angle=140,end angle=60,radius=2.0cm] node [pos=1.2]{\textit{spell-out on DP}};
\draw[]([xshift=-25pt]DPphase) arc[start angle=140,end angle=60,radius=2.0cm] node [pos=1.2]{\textit{DP phase}};
\end{forest}

Here’s what I got:
screen-shot-2016-12-06-at-3-09-43-am

#LaTeX, #forest, #syntax, #tree-structure, #phase, #draw-arc

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