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\documentclass{minimal}
\listfiles
%\usepackage[T1]{fontenc}
%\usepackage[latin1]{inputenc}
\usepackage{pstricks,pst-jftree}
\pagestyle{empty}
\parindent=0pt
\begin{document}
\deftriangle\fixedtri(.8)(1)(-1)
\defbranch\steepmedleft(1)(2)
\defbranch\steepmedright(1)(-2)
\def\overnode#1#2{%
\vtop{\offinterlineskip
\halign{\hfil##\hfil\cr \vrule width0pt depth5pt #2\cr \pnode{#1}\cr}}}
\jftree[xunit=54pt,yunit=22pt,triratio=.5,everynode={\strut}]
\!\0{IP}
\fixedtri[triratio=.95]\1
\fixedtri{\triline{sono stati\hfil}}\cr
\!\1{FP}\medleft\2\medright\3\cr
\!\2{$F_{\rlap{$\scriptstyle[+strong]$}}$}
\medvert{\overnode{A1}{$arrestati_i$}}\cr
\!\3{Voice$_{\rlap{$\scriptstyle Pass$}}$}
\medleft{\hskip1.4em\overnode{A2}{Voice}$_{Pass}$}
\medright\6\cr
\!\6{$Agr_OP$}\medleft\7\medright\8\cr
\!\7{DP}\medvar{\overnode{A3}{alcuni uomini$_m$}}\cr
\!\8{${Agr_O}'$}
\steepmedleft{\overnode{A4}{$Agr_O$}}
\steepmedright\9\cr
\!\9{VP}\medvar{\quad\overnode{A5}{${\mathit{t}}_{\,i}$}
\overnode{A6}{${\mathit{t}}_{\,m}$}\quad}\cr
\endjftree
{\psset{nodesepA=0,nodesepB=3pt,arrows=->}
\ncarc[arcangle=45,nodesepA=5pt]{A2}{A1}
\nccurve[angleA=-150,angleB=-70]{A5}{A4}
\nccurve[angleA=-140,angleB=-70,nodesepA=3pt, linestyle=dashed]{A6}{A3}
\nccurve[angleA=-160,angleB=-100,ncurv=1.4,nodesepA=5pt]{A4}{A2}}
\end{document}
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