[pstricks] psmatrix and different colseps

[Markus Krebs]

Hi!

Here is my minmal example

\documentclass{scrartcl}
\usepackage{pstricks-add}
\begin{document}

\begin{psmatrix}[colsep=0cm,rowsep=.15,mnodesize=2.25cm]
\ovalnode{Start}{Start} 
&                             &                               & 
        &                & Gelbe & Schwarze \\
                         & 
[name=B]B  									&             									& [name=BBB] B $(0\mid 
3\mid 3)$& (BBB) & 0     & 0        \\
                         &            									& [name=BB] 
B                   & [name=BBG] G $(1\mid 2\mid 3)$& (BBG) & 1     & 
0        \\
\end{psmatrix}
\ncline{Start}{B}
\naput{$\displaystyle \frac{3}{9}$}
\psset{nodesep=4pt}
\ncline{B}{BB}
\ncline{B}{BG}
\ncline{B}{BS}
\end{document}

It's a part of a large tree. I want to change the colsep within 
column 4 and 5 (increase width of columns 1 to 4 and decrease width 
of columns 5 to 7).

I've tried it with a \hspace{-1cm} in every entry of colum 5 but this 
is not comfortable. I've tried also pscolhook without success.

Any suggestions?

Thanks in advance!

Markus