Select the three columns (rows); make an XY (or Line) chart
Double click on data series in the chart to open Format Data Series dialog;
open Axis tab and check the Secondary Axis box
best wishes
--
Bernard V Liengme
www.stfx.ca/people/bliengme
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"nemme" wrote in message
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How do I plot 2 variables on the Y axis, one on either side of the chart?

Both variables are tied by the one variable on the X axis.