If you are using a secondary axis, check the scaling on both axes. You may
have it set so that you can't see one of the series.

"Laura" wrote in message
...
I am creating a graph in Excel 2002. I have 2 data series and I need 2
y-axis
due to different concentrations between the 2 data series. Everytime I try
to
add the 2nd axis, I can only view one of the data series.