# increase vertical distance between nodes with forest

I have the following tree and want to increase the vertical space between the nodes. Is there a straightforward way to do this?

\documentclass{article}

\usepackage{forest}
\forestset{
sn edges/.style={for tree={parent anchor=south, child anchor=north,align=center,base=bottom,where n children=0{tier=word}{}}},
background tree/.style={for tree={text opacity=0.2,draw opacity=0.2,edge={draw opacity=0.2}}}
}

\begin{document}

\begin{forest}
sn edges
[D-Struktur,edge label={node[midway,right]{move $\alpha$}}
[S-Struktur
[Tilgungsregeln{,}\\Filter{,} phonol. Regeln
[Phonetische\\Form (PF)]]
[Regeln des anaphorischen Bezugs{,}\\der Quantifizierung und der Kontrolle
[Logische\\Form (LF)]]]]
\end{forest}

\end{document}


...

• OK. Thanks. I begin to understand this powerful package. I added: for tree = {l=3cm} to get all distances larger. – Stefan Müller Jul 2 '14 at 8:11
• I found somthing: could be the s sep=XXXcm – Eric Mar 9 '16 at 20:35