Plot multiple lines, same plot, different axes?

> Dear list,
 >
 > I would like to plot 2 series of numbers with very different 
ranges/scales as lines on the same
 > plot. I assumed this is commonly done and easy, but I have not found 
any help files (e.g. axis()
 > or matplot() that show how. I've searched many old posts to no avail.
 >
 > I'll be very grateful for any suggestions on how this is done.

Hi Zack,
If you have a look at the help page for twoord.plot in the plotrix 
package, it has some suggestions for avoiding misleading the viewer. It 
is possible that you might find gap.plot helpful as well.

Jim