[pstricks] No ticks at origin.

[David Arnold]

All,

Anyway I can turn off ticks at the origin? See the small cross  
produced in this image at the origin?

\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage[dvipsnames]{pstricks}
\usepackage{pstricks-add,auto-pst-pdf,preview}

\PreviewEnvironment{psgraph}

\begin{document}

\begin{center}
\psset{xAxisLabel=$x$,yAxisLabel=$y$}
\begin{psgraph}[trigLabels,trigLabelBase=2,dx=\psPiH]{<->}(0,0) 
(-0.5,-3)(3.5,3){0.6\linewidth}{2in}
\psplot[linecolor=blue,linewidth=1pt,algebraic]{0}{\psPi}{2*cos(2*x)}
\end{psgraph}
\end{center}

\end{document}

Thanks.

D.