[pstricks] problem with \listplot

[Goebel, Juergen]

Hi,

just another problem with \listplot: I'm using the following
structure to show a function.


\documentclass{article}

\usepackage{pstricks}
\usepackage{pst-plot}

\savedata{\bpsk}[{-40.00, -35.00}, {-39.84, -30.00}, {-39.68,
-30.00}, {39.84, -20.00}, {40.00, -35.00}]

\begin{document}

\psset{unit=1mm}
\begin{pspicture}(0,0)(100,100)

  \psline(0,0)(9,0)(10,-1)(10,1)(11,0)(89,0)(90,-1)(90,1)(91,0)(100,0)
  \rput(50,35){%
      \listplot[plotstyle=line]{\bpsk}
   }
\end{pspicture}

\end{document}


The result is nearly acceptable - just one line disturbs! pstricks
shows a connection from (50,35) (the *new* (0,0)) to the starting
point of the \listplot (-40,-35). This is - following the docu - somewhat
logical, but it's absolutely unwanted. What do I have to do? 

And another question: The parameter plotstyle=line should lead to
a curve, consisting of a number of straight lines. The result of the
above example looks like a sort of spline-interpolation. Why?

Regards,

Juergen