[XeTeX] extraneous arrow when using \psaxes

[Daniel Greenhoe]

In documentation for pstricks, the statement
  \psaxes{<->}(0,0)(-2.5,0)(2.5,2.5)%
produces a y-axis (vertical axis) with an up-arrow only, and no down
arrow (which is "good" because in this example the y-axis forms a
T-intersection with the x-axis). But when I try it (compiling with
XeLaTeX), the y-axis has both an up-arrow and a down-arrow.

What I would like is for the x-axis to have left and right arrows, but
for the y-axis to have an up-arrow only. But contrary to what I have
seen in the documentation, that's not what I get. Did I do something
wrong?

The pstricks documentation I have here is "User's Guide" by Timothy
Van Zandt, 25 July 2003, Version 97. Here is an example (see also
attachments):

\documentclass[12pt]{book}
\usepackage{pstricks}                 % graphics support
\usepackage{pstricks-add}             % fixe and addons for pstricks
\setlength{\parindent}{0pt}
\begin{document}%
\psset{unit=8mm}%
\begin{pspicture}(-2.5,0)(2.5,2.5)%
  \psaxes{<->}(0,0)(-2.5,0)(2.5,2.5)%
\end{pspicture}%
\end{document}%

Many thanks in advance,
Dan
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