How to create this axis (pictured)

[tungle]

Hi,
I need to create an axis, with some part in the middle truncated (since 2 set of data differ greatly). I don't know how to describe in words, so pls refer to the image attached.
Appreciate your help, tks.

[romperstomper]

No picture attached, but I suspect you mean something like this.

[tungle]

ah, broken Y axis. tks, romperstomper. I'll give the tute a try, http://peltiertech.com/Excel/Charts/BrokenYAxis.html (it looks like with old version thou).