More vertical space at bottom

I noticed that Prosper adds more space between lines at the end of the slide. 
There is additional space between the last two lines in this example:

\documentclass[azure,pdf]{prosper}
...
%========================================================================================================================
%
\overlays{3}{
\begin{slide}{Discussion}
  Up to $10^6$ tags can be synthesized and detected (\emph{Brenner et al., 
2000}). Small numbers of tag sequences can be detected with DNA
  chips.

  \FromSlide{2}
  The second approach is easier to implement but limited to a few hundred RNA 
molecules. With current technology, up to 1000 different
  lengths can be distinguished. However, $p$ has to be determinded 
experimentally.

  \FromSlide{3}
  No experiments with our proposed methods have been carried out yet.  
\end{slide}
}


I use xpdf, AFPL ghostscript 7 and teTeX 2.0. 

Boris Hollas
I use AFPL ghostscript 7 and teTeX 2.0. 



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