plotting question

plotting with "plot2d" and the gnuplot terminal,

I noticed that one can zoom in by selecting a box with the right mouse
and
then clicking.

Is there a way to zoom back out, or reset the plot to the original?

This can be done with "openmath" format, but there seem to be many
fewer options with the openmath format.

Thanks,
  -sen

-- 
  ---------------------------------------------------------------------------
  | Sheldon E. Newhouse            |    e-mail: sen1 at math.msu.edu           |
  | Mathematics Department         |       				   |
  | Michigan State University      | telephone: 517-355-9684                |
  | E. Lansing, MI 48824-1027 USA  |       FAX: 517-432-1562                |
  ---------------------------------------------------------------------------