[pstricks] Chopping

[David Arnold]

All,

This:

\documentclass[12pt]{article}

\usepackage{pst-bar}
\usepackage{pst-plot}
\usepackage{pst-tree}
\usepackage{pstricks-add}

\begin{document}

\begin{center}
\psset{unit=0.5}
\begin{pspicture}[shift=-2](-8,-0.5)(8,0.5)
\psaxes[arrowscale=1.5,arrows=<->,yAxis=false](0,0)(-8,0)(8,0)
\end{pspicture}
\end{center}

\end{document}

When compile with: simpdftex latex test.tex (Texshop's default),  
produces this:

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But this:

\documentclass[12pt]{article}

\usepackage{pst-pdf}
\usepackage{pst-bar}
\usepackage{pst-plot}
\usepackage{pst-tree}
\usepackage{pstricks-add}

\begin{document}

\begin{center}
\psset{unit=0.5}
\begin{pspicture}[shift=-2](-8,-0.5)(8,0.5)
\psaxes[arrowscale=1.5,arrows=<->,yAxis=false](0,0)(-8,0)(8,0)
\end{pspicture}
\end{center}

\end{document}


When compile with: ps4pdf test.tex, produces:

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Why does the latter crop the numbers like this? Is there some option  
I should be giving to ps4pdf?

David.