I have the basic Ruby gnuplot interface working.  I don't seem to get
the zooming feature I'm used to when using gnuplot>.  Thus 2 questions:
1) How to provide the usual zooming feature when using gnuplot through
ruby?
2) How to add grid lines?
3) Is there any good example documentation for someone with more ruby
experience than gnuplot experience?  I've already been here:
http://rgplot.rubyforge.org/

Thanks,

Rob
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