I am including syntactic trees in my dissertation. Below each tree there is a tremendous amount of white space, which will cause the university's editorial office to scream and howl and moan, then ultimately to reject my dissertation until I fix it. How do I remove the superfluous white space below the tree?
MWE:
\documentclass{article}
\usepackage{tikz-qtree,tikz-qtree-compat}
\usepackage{gb4e}
\tikzset{every tree node/.style={align=center, anchor=north}}
\begin{document}
The relevant structure in \ref{tree:opt-marker-verb-move} shows the necessary movement for the verb to precede the suffix. XP refers to some unknown structure to which the verb is drawn.
\begin{exe}
\ex
\leavevmode\vadjust{\vspace{-\baselineskip}}\newline %this command makes the example number line up with the top of the tree, rather than the bottom
\begin{tikzpicture}
\tikzset{every tree node/.style={align=center,anchor=north}}
\Tree [.XP \node(XP){};
[.\textsc{FocusP} =em
[.TP
[.vP {}
[.VP {}
[.V \node(VERB){puv}; ]
] ] ] ] ]
\draw[->] (VERB) [in=-90,out=-90,looseness=1.5] to (XP);
\end{tikzpicture}\label{tree:opt-marker-verb-move}
\end{exe}
It is difficult to justify this verbal movement. First, we would have to identify a higher structure in a suitable relationship with the verb to motivate verbal movement. Then we would have to identify features to check that exist on both the new structure and the verb.
\end{document}