The chart needs at least two series to enable secondary axes. Double click
one of the series, and on the Axis tab, choose Secondary.

- Jon
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Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
http://PeltierTech.com
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"JRD" wrote in message
...
I want to plot an xy scatter graph with 2 different y scales - is this
possible? If so, how?

Many thanks