Rather than visit another website and download a file to find out the
method, the one line answer you need is format one of your data series
and then choose "Plot series on Secondary Axis"
(right click format or use the chart toolbar / layout ribbon to select
the series and click the button to format).

Once you have a secondary axis you can format this as you choose, fix
the scale etc.

Hope this helps
Adam

On 16/02/2010 16:39, GuyMac wrote:
I need to produce within the same graph two y scales one on the right and one
on the left