[pstricks] Missing labels at the end of the axes while using \psaxes

[Thomas Flisgen]

Dear PSTricks team,

I have a problem while using \psaxes. My x axis should be labelled from 
6.50 to 7.00 with a stepsize of 0.05. Unfortunately PSTricks does not 
plot the 7.00 at the end of the x-axis. Here is the code I'm using

\psset{xunit=2\textwidth,yunit=.05cm}
\begin{pspicture}(0,-150)(0.5,-20)
{\small
\psaxes[linewidth=.25pt,tickwidth=.25pt,axesstyle=none,Ox=6.50,Dx=0.05,Oy=-140,Dy=20](0.00,-140)(0.00,-140)(0.50,-20)
}
\end{pspicture}

Why it does not plot the 7.00? Can you help me modifying the code such 
that the 7.00 is plotted?

Thanks in advance
Thomas