Line chart:
Data Series:
Altitude
Oil Temp

Oil Temp uses the primary vertical axis and Altitude the secondary.

I want to add OAT (outside air temp), plotted against the primary axis. But
when I add the new data series it uses the secondary axis and plots itself as
a nearly straight horizontal line along the bottom of the chart. In this
position I cannot seem to 'select' the series with the cursor. How can I add
the OAT data series plotted against the primary axis.

I have just upgraded to Excel 2007.

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Art