\usepackage {pstcol,pst-node,pst-tree}
\psset{angleB=-90,arrows=->,nrot=:U}
\newcommand{\molesworth}[1]{%
\pstree[#1]{\Tdia{ }}
{
\Tp[arrows=->,edge={\ncbar[angleA=180]}]
\nbput{Gabbitas}
{\psset{linestyle=dashed,arrows=-} \Tp }
\Tp[arrows=->,edge={\ncbar}]
\naput{Thring}
}
}
\psset{showbbox=true}
\begin{tabular}{l}
\molesworth{}\\[1cm]
\molesworth{xbbl=1cm,xbbr=1cm}
\end{tabular}
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