[pstricks] pstThreeDCoor missing tick

[Richard K. Oliver]

Why is the 7th tick on the z-axis missing, and how do I make it appear (without increasing zMax)?

\documentclass{article} 
\usepackage{pst-3dplot,pstricks-add} 
\begin{document} 

\psset{unit=.6,plotpoints=2000,coorType=2}
\begin{pspicture}(-10,-10)(10,10)
\pstThreeDCoor[xMax=8,yMax=8,zMax=8,
  nameX=$x$,nameY=$y$,nameZ=$z$,IIIDticks]
\end{pspicture}

\end{document}

Sincerely,
R. K. Oliver
rko15 at att.net
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