[pstricks] behavior of arrows when plotting functions and scaling

[Ryan Higginbottom]

It seems to me that the commands \psline and \psplot have different
behaviors with respect to arrowheads, and I was wondering if there is a
way to correct the behavior of \psplot in this regard.  The example I
include below is very simple, but it illustrates the problem I'm having
with something a bit more complex.  I would like to use the arrows=<-o
option, but when I scale the units, the arrowheads seem to be slightly
misplaced.  (Note: this doesn't seem to happen when the units are left
alone.)

When you compile the example below and magnify a bit, you will see what I
mean.  The arrows on the top line are off a bit.  (I am trying to write
something for a powerdot presentation, so even though the magnification
may seem insignificant here, it is clear when on the presentation.)

Thank you for your help.

Example:
--------------------
\documentclass{article}
\listfiles
\usepackage{pstricks}
\usepackage{pstricks-add}

\begin{document}
\psset{xunit=.5cm,yunit=.5cm}
\psline[arrows=<-o,linewidth=1pt](0,0)(2,0)
\psplot[arrows=<-o,linewidth=1pt]{0}{2}{1}
\end{document}
--------------------
 *File List*
 article.cls    2005/09/16 v1.4f Standard LaTeX document class
  size10.clo    2005/09/16 v1.4f Standard LaTeX file (size option)
pstricks.sty    2005/12/19 v0.31 LaTeX wrapper for `PSTricks' (RN,HV)
pstricks.tex    2006/02/06 v1.14a `PSTricks' (tvz)
  xcolor.sty    2005/12/21 v2.09 LaTeX color extensions (UK)
   color.cfg    2005/12/29 v1.1 MiKTeX 'color' configuration
   dvips.def    1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
pstricks-add.sty    2005/03/03 package wrapper for pstricks-add.tex (hv)
pstricks-add.tex    2006/06/17 v2.75 `PSTricks-add' (hv)
pst-xkey.tex    2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
 xkeyval.sty    2005/11/25 v2.5e package option processing (HA)
 xkeyval.tex    2005/11/25 v2.5e key=value parser (HA)
 ***********

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com